Grade 10 Physics Transverse waves Period and Frequency

Miss Martins Maths and Science

30 Jan 202415:05

Summary

TLDRIn this video, Miss Martins explains the concepts of period and frequency in waves, specifically for transverse waves. She discusses the definitions, symbols, and units of period, as well as how to calculate it using graphs. Miss Martins also demonstrates how period and frequency are related as reciprocals, providing clear examples with wave graphs. The video includes practice questions to calculate frequency and period, helping students understand how to find these values using formulas. The video is part of a broader wave series and emphasizes the importance of accuracy in units and definitions.

Takeaways

😀 Period is the time taken for one complete wave pulse and is measured in seconds (s).
😀 The symbol for period is 'T', while the unit of measurement is seconds (s).
😀 When determining the period from a graph, find one wave length by measuring from crest to crest or trough to trough.
😀 The period of a wave is the time it takes for one complete wave to pass a given point.
😀 Frequency (f) is the number of wave pulses that pass a given point per second and is measured in Hertz (Hz).
😀 Period and frequency are reciprocals, meaning if you know one, you can calculate the other using the formula: Period = 1/Frequency.
😀 If the period of a wave is given, its frequency can be found by taking the reciprocal (1/Period).
😀 If the frequency is given, the period can be calculated by the reciprocal (1/Frequency).
😀 In graphs where the time axis is marked, measure the distance between two successive crests (or troughs) to determine the period.
😀 When calculating period, if there are multiple waves in the given time, divide the total time by the number of waves to get the period for one wave.

Q & A

What is the definition of the period of a wave?
-The period of a wave is the time taken for one complete wave pulse to pass a given point. It is measured in seconds, represented by the symbol 'T'.
What is the difference between the symbol for period (T) and the unit of measurement (seconds)?
-The symbol 'T' represents the period, which is the time taken for one complete wave pulse. The unit of measurement is 'seconds', abbreviated as 's'. It’s important to note that saying 'sec' is incorrect in certain contexts, such as in matric exams.
How can you find the period of a wave from a graph?
-To find the period on a graph, identify one complete wave by looking at points in phase, such as from crest to crest or trough to trough. The time between these points, measured on the time axis, represents the period of the wave.
How do you calculate the period of a wave if two successive points in phase are given?
-If you are given two successive points in phase, such as two crests, measure the time between them using the time axis on the graph. The period is the time difference between these points.
What does it mean if the period of a wave is 10 seconds?
-If the period of a wave is 10 seconds, it means that it takes 10 seconds for one complete wave pulse to pass a given point.
What is the relationship between period and frequency?
-Period and frequency are reciprocals of each other. If the period is known, the frequency can be found by taking the reciprocal (1/period), and vice versa. The unit for frequency is Hertz (Hz).
How do you calculate the frequency of a wave if the period is given?
-The frequency can be calculated using the formula: frequency = 1 / period. For example, if the period is 4 seconds, the frequency would be 1/4 = 0.25 Hz.
What does it mean if the frequency of a wave is 50 Hz?
-If the frequency of a wave is 50 Hz, it means that 50 wave pulses pass a given point each second.
How do you find the period of a wave if you know the frequency?
-If you know the frequency, the period can be calculated by taking the reciprocal of the frequency. For example, if the frequency is 10 Hz, the period would be 1/10 = 0.1 seconds.
How do you calculate the period when two waves pass in a certain amount of time?
-If you are told that a certain time (e.g., 4 seconds) corresponds to multiple waves (e.g., 2 waves), divide the total time by the number of waves to find the period. For example, 4 seconds for 2 waves means the period is 2 seconds.