1. AS 91170 Physics 2.3 Waves 9 Weeks External, 4 Credits

3. Wave is ‘transfer of energy’ The energy is transferred through particles, which are called the ‘medium’ of the wave. The particles of medium are not transferred along the wave.

6. So, what about the tennis ball? A. Moves further away B. Comes closer C. Moves to the left D. Moves to the right E. Disappears F. None of the above

9. Other examples of wave motion Mexican Wave Hip-hop arm wave Slinky

11. Longitudinal – The vibration and the wave motion are parallel Transverse – The vibration and the wave motion are perpendicular Longitudinal wave motion vs. Transverse wave motion

17. Amplitude Trough Crest Wavelength Period Frequency Wave speed

18. Period: The time taken for one wave to completely pass. Unit: seconds Symbol: T Frequency: The number of waves passing in one second. Unit: hertz (Hz) Symbol: f

19. Example You are at a beach, watching the waves come in. You counted 30 waves in one minute. What is the period of the water wave? What is the frequency?

20. Example 2 You are now at a different part of the beach, and you counted 90 waves in one minute. What is the period? What is the frequency?

21. Frequency & Period 2 waves in one second. 15 waves in two seconds. 30 waves in ten seconds. 15 waves in one minute. 240 waves in one minute.

22. Frequency and Period Hz = s -1

23. a)Find the period. b)Find the frequency. c)Find the wave speed.