Science 10 Quarter 2 Module 1- The Development of Electromagnetic Wave Theory.

Summary

In this educational video, Sir Eduardo DiMaggi Jr., a science teacher at Don Pablo ES Billiard High School, introduces the development of electromagnetic wave theory. He discusses the importance of understanding electromagnetic waves in daily life, such as using cell phones and the internet. The video covers key scientists like Ampere, Hertz, Maxwell, and Oyster, who contributed to the theory. It also includes interactive activities to help students compare wavelengths, identify scientists, and understand the theory's significance. The lesson aims to deepen students' comprehension of electromagnetic waves and their applications.

Takeaways

• 🌟 The video is a lesson for students on the development of electromagnetic wave theory, taught by Sir Eduardo DiMaggi Jr.
• 📚 The main learning competency is to compare the relative wavelengths of different forms of electromagnetic waves.
• 🌐 Electromagnetic waves are a part of our daily life, used in radios, televisions, cell phones, and even the warmth from the sun.
• 🔍 The module aims to describe electromagnetic waves, identify key scientists, and understand their contributions to the theory.
• 🧐 Students are encouraged to keep an activity notebook to record concepts and activities related to the module.
• 🕵️‍♂️ Scientists like Ampere, Hertz, Maxwell, and Oyster are highlighted for their significant contributions to the field of electromagnetism.
• 📈 The timeline of electromagnetism includes discoveries from the early 1800s to the late 1800s, with key advancements in understanding electricity and magnetism.
• 🌈 Electromagnetic waves are transverse, meaning their oscillations are perpendicular to the direction of wave travel.
• 🚀 The speed of electromagnetic waves in a vacuum is a constant, approximately 300,000 kilometers per second, which is the speed of light.
• 🤔 The discovery of electromagnetic waves has significant implications for modern technology, including communication and medical imaging.

Q & A

What is the main topic of the video script?

The main topic of the video script is the development of electromagnetic wave theory.

Who is the speaker in the video script?

The speaker in the video script is Sir Eduardo Dimaggi Junior, a science teacher at Don Pablo ES Billiard High School.

What is the most essential learning competency for the students in this module?

The most essential learning competency for the students is to compare the relative wavelengths of different forms of electromagnetic waves.

Which scientist formulated the electromagnetic wave theory?

James Clerk Maxwell formulated the electromagnetic wave theory.

What is the speed of electromagnetic waves in a vacuum?

The speed of electromagnetic waves in a vacuum is approximately 300,000 kilometers per second, which is the same as the speed of light.

What is the significance of electromagnetic waves in our daily lives?

Electromagnetic waves are significant in our daily lives as they enable communication through devices like radios, televisions, cell phones, and the internet.

What is the difference between transverse and longitudinal waves as mentioned in the script?

Transverse waves are waves where the oscillations are perpendicular to the direction of wave propagation, while longitudinal waves have displacements in the same or opposite direction as the wave propagation.

Which scientist discovered the connection between electricity and magnetism?

Hans Christian Ørsted discovered the connection between electricity and magnetism.

What is the contribution of Michael Faraday to the development of electromagnetic theory?

Michael Faraday contributed to the development of electromagnetic theory by discovering electromagnetic induction.

What is the Faraday effect mentioned in the script?

The Faraday effect, discovered by Michael Faraday, is the influence of an external magnetic field on the propagation of light through a material.

Who demonstrated the existence of electromagnetic waves and their link to light?

Heinrich Hertz demonstrated the existence of electromagnetic waves and their link to light.

Outlines

00:00

📚 Introduction to Electromagnetic Wave Theory

This paragraph introduces a video lesson by Sir Eduardo Dimaggi Jr., a science teacher at Don Pablo ES Billiard High School in Camarines Norte, Mercedes. The lesson focuses on the development of electromagnetic wave theory, aimed at students but open for anyone interested. The main learning competency is to compare the wavelengths of different electromagnetic waves. The teacher encourages students to download the video and use it for learning. The topic is introduced with a discussion on how electromagnetic waves are ubiquitous in daily life, from radio and television to cell phones and sunlight. The lesson aims to describe electromagnetic waves, identify key scientists who contributed to the theory, and create a concept map or comic strip of their contributions.

05:03

🔬 Early Discoveries in Electromagnetism

The second paragraph delves into the history of electromagnetism, starting with the discovery of ultraviolet radiation by Johann Ritter. It then discusses the pivotal work of Hans Christian Ørsted, who first demonstrated the connection between electricity and magnetism during a lecture. Ørsted's experiments showed that a compass needle was deflected by an electric current, indicating a magnetic field around a live wire. This discovery was foundational, leading to the concept of electromagnetism. The paragraph also mentions Ørsted's further experiments that confirmed the relationship between electricity and magnetism and his contributions to the development of the magnetic levitation train and other technologies.

10:04

🌐 Contributions to Electromagnetic Theory

This paragraph continues the historical narrative by discussing the contributions of André-Marie Ampère, who expanded on Ørsted's work by showing how a current-carrying coil behaves like a magnet and developed a mathematical theory of electrodynamics. It also covers the work of Michael Faraday, who discovered electromagnetic induction and laid the groundwork for electric power generation. The paragraph further explains how these discoveries led to practical applications like the telegraph and the development of electrical measurement techniques. It concludes with the mention of Peter Barlow's telegraphy system and its limitations, as well as Ohm's Law and its significance in electrical resistance.

15:05

🌐 The Evolution of Electromagnetic Understanding

The fourth paragraph discusses the advancements in the understanding of electromagnetism, particularly focusing on the work of James Clerk Maxwell. Maxwell's equations demonstrated the interconnected nature of electric and magnetic forces, predicting the existence of electromagnetic waves and their speed, which he equated with the speed of light. The paragraph also highlights Heinrich Hertz's experimental confirmation of electromagnetic waves and their properties, such as reflection and refraction. It touches on the discovery of X-rays by Wilhelm Conrad Röntgen and concludes with an activity for students to match scientific contributions with the scientists who made them, reinforcing the lesson's content.

20:07

🎓 Concluding the Electromagnetic Wave Theory Lesson

The final paragraph wraps up the lesson by encouraging students to reflect on what they have learned about electromagnetic waves and their significance in daily life. It prompts students to consider how the discovery of electromagnetic waves has impacted modern communication and technology. The teacher guides students to an activity where they correct statements about electromagnetic waves and to keep a record of the different types of electromagnetic waves they use in a day. The paragraph ends with a preview of the next module and a thank you note from Sir Eduardo Dimaggi Jr., inviting students to share their learnings and questions in the comment section.

Keywords

💡Electromagnetic Waves

Electromagnetic waves are disturbances that transfer energy through space and do not require a medium for transmission. They are transverse waves, meaning their oscillations are perpendicular to the direction of wave propagation. In the video, the development of electromagnetic wave theory is the main theme, and examples include radio waves, microwaves, and visible light, all of which are types of electromagnetic waves.

💡Electromagnetic Wave Theory

The electromagnetic wave theory is a fundamental concept in physics that describes the nature of light and electromagnetic radiation. It unifies electricity, magnetism, and optics into a single framework. The video discusses the historical development of this theory, highlighting the contributions of various scientists like James Clerk Maxwell and Heinrich Hertz.

💡Hertz

Heinrich Hertz is a scientist mentioned in the video who provided experimental evidence of electromagnetic waves. His work confirmed the theoretical predictions of James Clerk Maxwell and demonstrated that electromagnetic waves could be produced and detected, which is a key part of the video's historical narrative on the development of electromagnetic theory.

💡Maxwell's Equations

Maxwell's equations are a set of four equations that describe the behavior of electric and magnetic fields, as well as their interactions with matter. These equations are foundational to the theory of electromagnetism and are central to the video's discussion on the development of the understanding of electromagnetic waves.

💡Electromagnetic Induction

Electromagnetic induction is the production of an electromotive force across an electric conductor in a changing magnetic field. It is a key concept discussed in the video, with Michael Faraday being credited for formulating the principle behind it. The video explains how this principle is used in the construction of generators and transformers.

💡Transverse Waves

Transverse waves are waves in which the oscillations are perpendicular to the direction of the wave's propagation. Electromagnetic waves are an example of transverse waves, as their electric and magnetic fields oscillate perpendicular to the direction of wave travel. The video emphasizes this property to distinguish electromagnetic waves from other types of waves.

💡Longitudinal Waves

Longitudinal waves are waves in which the displacement of the medium is in the same direction or opposite direction to the direction of propagation of the wave. The video contrasts these with transverse waves, noting that electromagnetic waves are not longitudinal, which is an important distinction in understanding their properties.

💡Vacuum

In the context of the video, a vacuum refers to a space devoid of matter. The video explains that electromagnetic waves can travel through a vacuum, which is a unique property that differentiates them from mechanical waves, which require a medium to propagate.

💡Speed of Light

The speed of light is a constant value of approximately 299,792 kilometers per second in a vacuum. The video discusses how this speed is related to the propagation of electromagnetic waves, emphasizing that all electromagnetic waves, including light, travel at this speed in a vacuum.

💡Electromagnetic Spectrum

The electromagnetic spectrum refers to the range of all possible frequencies of electromagnetic radiation. The video mentions that the spectrum includes various types of waves such as radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays, all of which are discussed in the context of their discovery and application.

Highlights

Introduction to the development of electromagnetic wave theory for students.

Essential learning competency: comparing the relative wavelengths of different electromagnetic waves.

Everyday experiences with electromagnetic waves through devices like radios and cellphones.

Electromagnetic waves are a natural occurrence, even felt as warmth from the sun.

Pretest questions to test knowledge on the nature and behavior of electromagnetic waves.

Fact or bluff activity to discern true statements about electromagnetic waves.

Timeline of electromagnetism and classical optics detailing key scientists' contributions.

Hans Christian Ørsted's discovery uniting electricity and magnetism.

Andre-Marie Ampère's work on the magnetic effect based on the direction of current.

Michael Faraday's principle behind electromagnetic induction leading to the first electric power generator.

James Clerk Maxwell's equations demonstrating electric and magnetic forces as aspects of electromagnetism.

Heinrich Hertz's experimental evidence of electromagnetic waves and their link to light.

Activity to match scientists with their contributions to the development of electromagnetic wave theory.

Concept webcomic activity to illustrate the significance of electromagnetic waves in daily life.

Discussion on the speed of electromagnetic waves and their ability to travel through a vacuum.

Review of key scientists' contributions to the understanding of electromagnetism.

Activity 'Connecting Ideas' to correct statements about electromagnetic waves with happy or sad faces.

Reflection on learning and the practical applications of electromagnetic waves in modern technology.

Vocabulary review defining key terms used in the module.

Additional enrichment activity to identify and encircle the names of scientists who contributed to EM wave theory.

Transcripts

okay uh good days this video was created

for

my students of

don pablo es billiard high school here

in camarines norte a district of

mercedes and

if if you find this is useful even you

are not my students

who is watching this video you are free

to download it or to use this in your

students hopefully you will learn from

this video lesson okay i am

sir eduardo dimaggi junior science

teacher science 10

so

our topic for today is the second

quarter or the quarter tom the module

one the development of electromagnetic

wave theory

these are the development theme of this

module so i'm not going to read it one

by one

this is indicated in your soft copy or

hard copy of the

self learning modules for these students

the most essential learning competency

compare the relative wavelengths of

different forms of electromagnetic waves

and then the main topic of this module

is the development of the

electromagnetic wave theory

to begin with

we all know that we are surrounded with

different types of waves and most of

them are invisible or cannot be seen by

our naked eye but we can perceive some

of them

if you have listened to a radio on the

television

spoken us on a cellular phone sent a

text message and a messenger or we are

experiencing the so-called

electromagnetic wave meaning in our

daily basis in our environment we are

experiencing

the electromagnetic wave and even now

that you are watching my video you are

also experiencing the electromagnetic

wave and actually taken and felt the

warm the sun on your skin then you have

experienced the electromagnetic wave

therefore we can say that the

electromagnetic wave

is

existing in our nature so in this module

you will learn how the electromagnetic

waves came to be okay

and our targets for this module describe

electromagnetic waves identify the

scientists with great contribution to

the development of electromagnetic wave

jury make a comic strip concept map of

the contributions of the scientists to

the development of electromagnetic

theory

before we proceed to the different

activities

included

in this module we have to answer this in

your answer sheet or in your notebook in

my students i am suggesting that you

have to provide your activity notebook

uh for you to be able to save the

concepts the activities you had made

says involving in this module so let us

start with

number one

okay in this

try this number one who among the

scientists below had formulated the

electromagnetic wave theory letter a

ampere letter b hertz

letter c maxwell letter d oyster

and number two

what can electromagnetic waves travel

true that mechanical waves cannot

letter a air

letter b wood

letter c water letter d vacuum and

number three which of the following

statements is incorrect again incorrect

about e m waves a

em waves can transfer energy through a

vacuum through a medium and vacuum

letter b em waves vary in speed

frequency and wavelength letter c am

waves have electric and magnetic fields

letter d am waves form when energy is

transferred through field

for number four an electromagnetic wave

is produced by a letter a oscillating

electric and magnetic wave

b dispersion of water wave letter c

an earthquake

letter d vibration through air and other

media

for number five electromagnetic waves

are blank waves rather than longitudinal

waves

letter a transverse letter b

compressional letter c shear letter d

seismic

okay as we proceed with the different

activities

lessons here in this module you will

find out

the answers in this

pretest so let us now proceed

to

do this okay activity

a fact or a bluff

in our directions release a statement

carefully with the fact if the statement

describes electromagnetic waves or if

the statement is correct and bluff if

the statement is incorrect number one

electromagnetic waves are formed when an

electric field comes in contact with a

magnetic field number two em waves are

compressional waves number three em

waves travel with a constant velocity of

three times ten raised to seven

meter per second in a vacuum

electromagnetic waves can split into a

range of elec of frequencies known as

the electromagnetic spectrum

the electric field and magnetic field of

an electromagnetic wave are

perpendicular

or at right angles to each other let us

now check if your answers are correct

number one

the answer

this is fact this is correct

electromagnetic waves are formed when an

electric field comes in contact with a

magnetic field

and number two

the answer is bluff by bluff because em

waves are transverse wave they are not

compressional waves

so number three

the answer is also bluff

because em waves travel with a constant

velocity of three times ten the exponent

is eight not seven meter per second in a

vacuum if we are going to convert to

kilometer

and not in scientific notation we're

going to convert in kilometer that is

300

000 kilometer per second that is the

speed

of electromagnetic waves in a vacuum

and in number four the answer is

fact that is correct number five also

correct

so

let us now proceed

to the timeline

of

electromagnetism and

classical optics so in this timeline we

are going to

discuss the different scientists who

contributed to the development or to the

discovery of electromagnetism and the

classical optics so

the number one is johan ritter

he discovered ultraviolet radiation from

the sun next is 1820 hans christian

oilstead he is adani's physicist and

chemist

united the separate sciences of

electricity and magnetism and when has

christians or sister discovery he united

the separate sciences of electricity and

magnetism that's why we call now as

electro magnetism

for your additional information hans

christian oyster accidentally discover

this conducting a lecture on his class

so he develops an experiment in which he

notices a compass needle is deflected

from magnetic north when an electric

current from the battery he was using

was switched on and off convincing him

that magnetic fields reject from all

sides

of the of a live wire just as light and

he confirming a direct relationship

between electricity and magnetism

therefore

with the discovery of hans christian

oyster he found out that the electricity

and magnetism are inseparable meaning

they are interrelated he also observed

that the movement of the compass needle

to one side of the other depends upon

the direction of the current following

intensive investigations he conducted

different investigation different

experiments as a scientist before

giving a conclusion

he conducted different kinds of

experiments he published his findings

proving that a changing electric current

produces a magnetic field as it flows

through a wire meaning if a wire

carrying an electricity or it is

connected to a source

a wire

can be

converted to magnet or it can produce

magnetic field or magnetism

and that is now currently used

in

different countries for example in the

magnetic levitation train that is

electricity uh to magnetism and

different applications nowadays

okay

in 1820 another scientist andrea marie

ampere professor of mathematics they

called polytechnic

a short time

after learning of airstrip discovery

that a magnetic needle is acted on by a

baltic current conducted experiments and

published a paper

and

analyzed the kami at the pc attempting

to give combined theory of electricity

and magnetism or he showed that a coil

of wire carrying a current behaves like

an ordinary magnet

this is just a continuation of the idea

of the experiment of oyster

he used also in telegraphy during that

time the communication is the telegraphy

he mathematically developed ampersal

describing the magnetic force

between two electric currents his

mathematical theory explains known

electromagnetic phenomena and predicts

new ones

his loss of electrodynamics includes the

fact that parallel parallel conductors

carrying current in the same direction

attract and those carrying currents in

the opposite direction repel one another

so that is just like the property of

magnetic

repulsion and attraction property

one of the first to develop electrical

measuring

techniques he built an instrument

utilizing a free moving needle

to measure the flow of electricity

contributing to the development of the

galvanometer

in 1821 he proposed a telegraphy system

utilizing one wire per galvanometer to

indicate easter and reported

experimenting successfully with such a

system however in 1824 there's another

scientist peter barlow reported its

maximum distance was only 200 feet

meaning it cannot travel

a long distance

so

meaning it is impractical so in 1826 he

published the memoir on the mathematical

theory of electrodynamic phenomena

uniquely deduced from experiment

from experience containing a

mathematical derivation of the

electrodynamic force law

following faraday's discovery of

electromagnetic induction in 1831 ampere

agreed that faraday deserve full credit

for the discovery in 1821 andrey marie

ampere announced his story of electro

dynamics predicting the force that one

current exerts upon another

so in 1826

uh other additional information for

ampere when you say ampere

just put in it in your mind that is the

unit of

current so in 1826 george simon um

stated his ohm's law

or electrical resistance in the user

published in the this landmark pamphlet

died the unit ohms of electrical

resistance has been named in his honor

capacity 31 michael fardi began

experiments leading to its discovery of

the law of electromagnetic induction

through the discovery may have been

anticipated by the work of

francisco

sante

his breakthrough came when he wrapped

two insulated coils of wire around the

massive iron ring bolted to chair

okay the discovery of michael faraday

about the electromagnetic induction

lead to the principle to construct the

so-called electrodynamo or the first

electric power generator okay in 1845

michael faraday discovered that light

propagation in a material can be

influenced by external magnetic fields

or the faraday effect in 1855 james

clerk maxwell submitted on faraday's

lines of force

for publication containing a

mathematical statement of ampere's

circle relating the curl of magnetic

field to the electrical

in 1861 the first continental telegraph

system spans north america by connecting

an existing network on the united states

to a small network in california by a

link system ohama and carson city via

salt lake city

the slower pani express system ceased

operation a month later

so in 1864 james clark maxwell publishes

papers on the dynamical theory of the

electromagnetic field in 1865 james

clark maxwell published his landmark

paper a dynamical theory of the

electromagnetic field in the maxwell's

equation demonstrated that electric and

magnetic forces are two complementary

aspects of electromagnetism so therefore

with the current contribution current

scientists they found out that

electricity and magnetism are two

inseparable

things that they are interconnected with

each other we can create magnet from

electricity we can create electricity

from magnetism so he showed that the

associated complementary electric and

magnetic fields of electromagnetism

traveled through space in a form of

waves at a constant velocity of

3 times 10 raised to 8 meter per second

this is included in our pre-test a while

ago

he also proposes that light is a form of

electromagnetic radiation and actually

that density

that three times 10 raised to eight

meter per second

is actually the speed of light in a

vacuum

and that waves of oscillating electric

and magnetic fields travel through empty

space at a speed that could be predicted

from simple electrical experiments using

available data he obtains a velocity of

310

million 740

000 meter per second and that is the

velocity of the electromagnetic waves

and the stage

this velocity is sounding seems we have

a strong reason to conclude that light

light itself including rigid heat

and other radiations if any is an

electromagnetic disturbance in the form

of waves propagated through the

electromagnetic field according to

electromagnetic loss

in 1873 james clerk maxwell published a

magnetism which states that light is an

electromagnetic phenomenon

and in 1887 henrich henrich hertz

invented

a device of the production and reception

of electromagnetic range waves his

receiver consists of a coil

with a spark gap so in 1888 henrich

hertz demonstrated the existence of

electromagnetic waves by building an

apparatus that produced and detected

uhf radio radio waves or microwaves in

the uhf region he also found that

radio waves be transmitted through

different types of materials that were

reflected by others the key to radar

radar this is the radio application

detection and ranging this experiment

explained reflection refraction

polarization interference and velocity

of electromagnetic waves in 1895 wilhelm

conrad jin discovers the so-called

x-rays

so we are now currently using this

medical area he named that x-rays

because he do not know what kind of race

is that so maybe if obviously he named

that as

frenchin array that should be today

called asteroidan race

but he named that as an x-ray

okay let's now proceed to this activity

one so

in your activity notebook you're now

going to answer based on the discussion

we're going to match

from this first

column

we have doing the number and then we

have the

underline you're going to put the answer

from the column b just put the letter

only

for example in number one

what is your answer is that letter a

contributed in the development the

developing equations that show the

relationship of electricity and

magnetism

c

the name of the scientist here at the

lower portion of their pictures so you

can identify you can go back to my

discussion about the timeline of the

different scientists who contributed to

the development of the electromagnetic

wave

theory so that is the explorer so an

activity to expanding your view

direction make a concept webcomic strips

of the contributions of the following

science and our guide questions

what insights did you learn about

electromagnetic waves so you can now

write jet down in your activity notebook

what are the insights

did you learn about em waves or you may

type here you may comment here

so i'm going to read

all your comments here what are your

insights to learn about electromagnetic

waves and number two

how significance it is the discovery of

em webs in our life so imagine if those

scientists did not discovered about the

electromagnetic waves

do you think you message someone

using your cell phone

can you call someone using our gadgets

our laptop our computer

or

can you be updated

in the different events happening

worldwide with the use of your gadget

keep this in mind

about electromagnetic waves these are

the different definitions

electromagnetic waves are disturbances

that transfer through film

electromagnetic waves are transverse

wings

next do not require a medium for

transmission

meaning even in a vacuum even without

anything

or any medium like air like water like

any materials electromagnetic waves can

travel remember that property of

electromagnetic wave

and trouble with the same speed in the

absence of matter or that's the

so-called vacuum and this speed is

absolute

the am waves travel at a constant speed

of 300 million meters per second speed

of light or if you are going to convert

to kilometer that is 300 000 kilometer

per second that is

the speed that's why even this within

the speed of second

we can receive

information where we can receive the

messages sent from the different places

going to us or we can send back our

message to them

because of this

speed of the electromagnetic waves

electromagnetic electromagnetic waves

are produced by accelerating electrons

electromagnetic waves are combination of

electric and magnetic fields that

oscillate perpendicular to each other

and to the direction of the wave

and scientists who did great

contributions to the development of

electromagnetic wave theory are as

follows we have andre ampere

andre mariampere he demonstrated the

magnetic effect based on the direction

of current we have michael faraday

he formulated the principle behind

electromagnetic induction henrich hertz

now henry's rudolph heard he showed

experimental evidence of electromagnetic

waves and their link to light

so james clerk maxwell he contributed in

developing equations showing the

relationship of electricity and

magnetism

and hence christian oyster he showed how

a current carrying wires behave like a

magnet so

let us be thankful with this great

scientists who contributed to the

development of the

electromagnetic wave

so you are now familiar with the

different scientists behind the

discovery of electromagnetic waves

let's check your understanding in the

succeeding activity so you're going to

apply what you have learned okay in this

activity entitled connecting ideas the

direction religious statement correct

carefully put a happy face of the

statement is correct and if the

statement is incorrect or wrong draw a

sad face or underline the words that

make it wrong and write the correct

answer so as simple as that we have one

to ten

so number one electromagnetic wave is

considered as longitudinal wave number

two

em waves do not require a medium to

propagate em waves are combination of

electric and magnetic fields that

oscillates perpendicular to each other

and to the direction of the wave number

four em waves are produced by

accelerating protons

em waves travel at a constant speed of

three hundred

thousand meter per second ampere showed

experimental evidence of em waves and

they were linked to light

faraday for number seven from faraday

formulated the principle behind

electromagnetic induction number eight

urstead show how a current wire

behaves like a magnet and number nine

maxwell demonstrated the magnetic effect

based on the direction of current number

10 hertz contributed in developing

equations showing the relationship of

electricity and congratulations you have

just finished the supplementary learning

modules about the development of

electromagnetic waves so reflect i have

learned that what have you learned

you may also type here in our video in

our comment section

you may type your learning

and you may also

write down i wish to ask my teacher

about what is your question and

reinforcement keep a record of the

different kinds of electromagnetic waves

you use in one day

which em waves do you use most often

so

based on this module

maybe this reinforcement can be

reinforced more in our next succeeding

modules the continuation of this

discussion and in our vocabulary release

the following terms used in this module

are defined as follows so

electromagnetic induction

production of electromotive force across

an electric conductor

in a changing magnetic field

electromagnetic wave a disturbance in a

field that carries energy and does not

require a medium to travel

longitudinal wave are waves in which the

displacement of the medium is in the

same direction or opposite direction to

and direction of propagation of the wave

transverse wave is a moving wave with

oscillations

are perpendicular to the direction of

the wave or path of propagation and wave

when i say wave a disturbance that

transfer energy or this is the carrier

of energy when it's a wave

and yes what have you learned we have

here

questions one two

five so you are going to answer this one

to five

identify what is asked or described in

each item then write the letter of the

correct answer number one

electromagnetic waves are produced by

blank

a current b voltage source

cna disturbances

d vibrating charge and number two

and the electromagnetic wave the

direction of propagation of the wave is

blank letter a always to the right b

cannot be determined

c parallel to the electric and magnetic

field direction letter d perpendicular

to the electric and magnetic field

direction

number three in the vacuum the speed of

magnet electromagnetic wave is letter a

zero

b always the same as the speed of light

c changing depending on the value of its

wavelength letter d none of the above

number four

he contributed in developing equations

showed the relationship of electricity

and magnetism

letter a and dremari ampere letter b

michael faraday

letter c james clark maxwell

letter d hans christian oyster number

five which of the following statements

is called is true about em waves letter

a

aim waves can transfer energy through a

medium only that will be em waves vary

in speed frequency and wavelength let us

see aim waves have electric and magnetic

field

em waves

form when energy is retained in the

field so for your additional enrichment

activity

okay we have the another activity here

my em heroes we are going to call this

as em wave scientists puzzle find answer

find and encircle the names of the five

scientists who contributed in the

development of em wave theory and

in the letter b identifying

contributions okay the direction from

your answer in figure one

write the names of the scientists in the

appropriate boxes in table one based on

their contributions

okay our next video lesson the module 2

the continuation

okay again thank you this is sir eduardo

di mali jr

thank you for watching