Introduction to Modern Physics
Summary
TLDRIn this video, Professor Dave introduces modern physics, highlighting the significant shift from classical physics in the early 20th century. He explains how classical physics, which dominated our understanding of the universe, began to falter when applied to subatomic particles and objects moving near the speed of light. This led to groundbreaking discoveries and the development of new physics theories like relativity and quantum mechanics. Professor Dave emphasizes the importance of understanding classical physics and general chemistry basics before diving into modern physics. He invites viewers to subscribe for more tutorials and support him on Patreon.
Takeaways
- π Our understanding of physics expanded greatly during the 17th to 19th centuries, thanks to the contributions of many brilliant scientists.
- π By the late 19th century, physics was thought to be almost fully understood, with classical mechanics and electromagnetism explaining most phenomena.
- π The universe was believed to be deterministic, where knowing the position and momentum of every particle could predict the past and future.
- π€ Early 20th-century discoveries challenged the deterministic view, revealing that classical physics couldn't explain phenomena at the subatomic level or near the speed of light.
- π¬ Modern physics emerged to address the limitations of classical physics, particularly in understanding the very small (quantum mechanics) and the very fast (relativity).
- π The transition from classical to modern physics marked a major paradigm shift in science, highlighting the strange and unpredictable nature of the universe.
- π§ Understanding modern physics requires prior knowledge of classical physics and general chemistry, as it builds upon these concepts.
- 𧩠Modern physics can only be fully appreciated in its historical context and as a response to the limitations of classical physics.
- πΊ The tutorials assume familiarity with basic classical physics concepts and terminology, as well as the structure of the atom.
- π₯ The video encourages viewers to explore classical physics and general chemistry playlists if they need more foundational knowledge before diving into modern physics topics.
Q & A
Who is delivering the information in the video script?
-The information is delivered by Professor Dave.
What major period of scientific development does the script focus on?
-The script focuses on the transition from classical physics to modern physics in the early 20th century.
What was the general belief about physics before the 20th century?
-Before the 20th century, it was believed that physics was almost completely understood through Newton's classical mechanics and Maxwell's classical electromagnetism.
What did Pierre Laplace suggest about the universe?
-Pierre Laplace suggested that if we knew the precise location and momentum of every particle in the universe, we could know everything about the universe, including its beginning and end.
What realms did classical physics fail to describe accurately?
-Classical physics failed to describe accurately the realm of the very small, like subatomic particles, and the realm of the very fast, like things moving close to the speed of light.
What did Einstein say about the world and its comprehensibility?
-Einstein said that the most incomprehensible thing about the world is that it is comprehensible.
What is necessary to fully appreciate modern physics according to the script?
-To fully appreciate modern physics, it is necessary to understand classical physics and have some knowledge about the structure of the atom from general chemistry.
What does the speaker suggest for viewers who might get confused while watching the modern physics tutorials?
-The speaker suggests that viewers who get confused should watch the classical physics playlist and general chemistry playlist available on the 'Professor Dave Explains' homepage.
What topics are included in modern physics according to the script?
-Modern physics includes topics like relativity, quantum mechanics, and other physics concepts of the 20th century and beyond.
What additional resources does Professor Dave offer to support his viewers?
-Professor Dave offers more tutorials on his YouTube channel, encourages viewers to support him on Patreon, and invites them to email him for further inquiries.
Outlines
π Introduction to Modern Physics
Professor Dave introduces the subject of modern physics, emphasizing its development through the 17th, 18th, and 19th centuries thanks to scientists' contributions. By the early 20th century, it was believed that physics was almost fully understood, with the universe appearing deterministic under Newton's classical mechanics and Maxwell's electromagnetism. French scientist Pierre Laplace suggested that knowing every particle's position and momentum would allow complete knowledge of the universe's past and future.
π Paradigm Shift in Physics
At the turn of the 20th century, cracks in the deterministic worldview began to appear. Classical physics, while accurate for everyday phenomena, failed at the subatomic level and at speeds close to light. This led to the realization that new rules were needed for these realms. The confusion marked the greatest paradigm shift in science, revealing a universe far stranger than previously imagined.
π¬ Prerequisites for Understanding Modern Physics
Professor Dave emphasizes the importance of understanding classical physics to grasp modern physics. He recommends watching the classical physics and general chemistry playlists to understand the historical context and basic concepts needed for modern physics. He stresses that the course assumes prior knowledge, making it essential for viewers seeking comprehensive understanding to be well-prepared.
π Preparing for the Course
Viewers are encouraged to delve into the course's content on relativity, quantum mechanics, and 20th-century physics developments. Professor Dave invites those interested in entertainment to proceed but suggests those seeking clarity should revisit foundational topics. He concludes by promoting his channel and Patreon, offering contact information for further engagement.
Mindmap
Keywords
π‘Modern Physics
π‘Deterministic
π‘Classical Mechanics
π‘Electromagnetism
π‘Pierre Laplace
π‘Subatomic Particles
π‘Speed of Light
π‘Relativity
π‘Quantum Mechanics
π‘Paradigm Shift
Highlights
Introduction to modern physics by Professor Dave.
Physics knowledge grew tremendously during the seventeenth, eighteenth, and nineteenth centuries.
Near the turn of the 20th century, Newton's classical mechanics and Maxwell's classical electromagnetism made it seem like we knew all there was to know about physics.
French scientist Pierre Laplace suggested that if we had precise information for every particle in the universe, we could know everything about the universe.
The concept of rigid causality characterized our understanding of the universe until the beginning of the 20th century.
Classical physics breaks down in the realms of the very small (subatomic particles) and the very fast (close to the speed of light).
A new generation of physicists had to figure out a whole new set of rules for these realms.
This period represents the greatest paradigm shift in the history of science.
Modern physics can only be fully appreciated in the context of its historical development and the ways classical physics failed to describe newly observed phenomena.
These tutorials assume some basic knowledge from classical physics and general chemistry regarding the structure of the atom.
If you are just watching these tutorials for entertainment purposes and get confused, you should refer to the classical physics and general chemistry playlists.
Topics to be covered include relativity, quantum mechanics, and other physics of the 20th century and beyond.
Encouragement to subscribe to the channel and support Professor Dave on Patreon.
Einstein's quote: 'The most incomprehensible thing about the world is that it is comprehensible.'
Invitation to get started with modern physics tutorials.
Transcripts
Hey it's professor Dave, I want to tell
you about modern physics.
Throughout the seventeenth, eighteenth,
and nineteenth centuries, our
understanding of physics grew
tremendously, thanks to the work of a
number of brilliant scientists. Near the
turn of the 20th century, between
Newton's classical mechanics and
Maxwell's classical electromagnetism, it
seemed like we knew just about all there
was to know about physics, and that
burgeoning young scientists should
choose another field of study, one with
more left to figure out. The universe
appeared to be completely deterministic
meaning that if we could know the
precise location and momentum of every
particle in a system, as well as the laws
that govern their motion, we could know
their location and momentum at any time
in the past or future. French scientist
Pierre Laplace even suggested that if we
had such information for every particle
in the universe we could know everything
about the universe, including how it
began, and how it would end. This concept
of rigid causality characterized our
understanding of the universe until the
beginning of the 20th century. It was
around this time that some cracks began
to form in the deterministic worldview.
Through a series of perplexing
discoveries we quickly realized that
while classical physics works just fine
for most earthly phenomena, it breaks
down when looking at the realm of the
very small, like subatomic particles, as
well as the realm of the very fast, like
things moving close to the speed of
light. In these two realms the laws that
we apply to cars and rocks and bowling
balls just don't work, and a new
generation of physicists had to figure
out a whole new set of rules. This period
of confusion represents the greatest
paradigm shift in the history of science
and a sobering lesson in the nature of
the universe, which is much strange
than anyone in the 19th century could
possibly have predicted. But Einstein
himself said that the most
incomprehensible thing about the world
is that it is comprehensible, so strive
to comprehend we shall. It is important
to mention that this modern physics
course builds upon the knowledge that we
developed in the classical physics
course. If your intention is to master
the concepts of modern physics and you
haven't yet learned classical physics,
you absolutely must go back and view
that playlist in its entirety. Modern
physics can only be fully appreciated in
the context of its historical
development and a discussion of the ways
that classical physics failed to
describe newly observed phenomena.
Besides this, these tutorials will assume
some basic knowledge regarding concepts
and terminology from classical physics
as well as knowledge from the general
chemistry playlist regarding the
structure of the atom, so it is a good
idea to do some preparation before we
start. Modern physics is hard enough to
understand without any handicaps. If on
the other hand you are just watching
these tutorials for entertainment
purposes, by all means proceed, but if you
get confused, you know where to go for
clarity. Just find the classical physics
playlist and general chemistry playlist
on the professor Dave explains home page.
So if you're ready to talk about
relativity, quantum mechanics, and all the
other physics of the 20th century and
beyond, let's get started now.
Thanks for watching, guys. Subscribe to my channel
for more tutorials, support me on patreon
so I can keep making content, and as
always feel free to email me:
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