1. Waves and Sound Review

2. #1 Transverse Wave Crest Trough Amplitude Home Wavelength

3. #2 Longitudinal Wave Compression Rarefaction

4. #3 Transverse –Medium moves to a Right angle (perpendicular) to the motion of the energy Longitudinal –Medium moves parallel to the motion of the energy

5. #4 Period –Time taken for 1 wavelength; one cycle of motion. Frequency –Number of vibrations that occur in 1 second The relationship between Period (T) and Frequency (f) is inverse proportional.

6. #5 No, it is the energy that moves along; the particle simply vibrates in a fixed location.

7. #6

8. #7

9. #8 One wavelength per period

10. #9 The time that it takes to make one complete swing back and forth; one cycle

11. #10 If you triple the frequency then the period is reduced by 1/3. What ever change happens to the frequency the reciprocal happens to the period.

12. #11 K: 10 waves/30 seconds, crest 5 m apart U: Period, frequency, wavelength, and wave speed. E: v = f S: Period = time for one cycle = 10 waves per 30 seconds means 1 wave every 3 seconds

13. #11 K: 10 waves/30 seconds, crest 5 m apart U: Period, frequency, wavelength, and wave speed. E: v = f S: Frequency = How many waves occur in one second = 10 waves/30 seconds = 1/3 wave per second

14. #11 K: 10 waves/30 seconds, crest 5 m apart U: Period, frequency, wavelength, and wave speed. E: v = f S: Wavelength = crest to crest distance = 5 m

15. #11 K: 10 waves/30 seconds, crest 5 m apart U: Period, frequency, wavelength, and wave speed. E: v = f S: v = f = (5m) x (1/3Hz) = 1.67 m/s

16. #12 Solids, liquids, and gases In solids Sound can not travel in the absence of matter (vacuum)

17. #13 Speed of sound increases with air temperature increases It also increases when humidity increases and density increases.

18. #14 Increase in Wave Frequency due to the moving of the source Doppler Effect

19. #15 Yes

20. #16 Constructive Interference –Addition to the waves amplitude Destructive Interference –Subtraction from a waves amplitude

21. #17 It is a property of all traveling waves

22. #18 The production of beats is the observation of inference in sound waves Inference in a sound wave occurs when you phase in or phase out a sound source Speakers 180 degrees out of phase produce no sound Speakers 0 degrees out of phase produce the maximum amount of sound

23. #19 Beat Frequency is f 1 -f 2 –Beat = 443 Hz – 440 Hz = 3 Hz

24. #20 For each increase in dB you increase it by a factor of 10 70dB – 60dB = 10 dB so 70 is 10 times louder than 60 –10dB = 10 1 80dB – 60dB = 20 dB so 80 is 100 times louder than 60 –20dB = 10 2

25. #21 Changes in the medium –Temperature –Humidity –Density Refraction is the bending of the wave do to changes in waves speed

26. #22 It bounces back and is out of phase 180 degrees

27. #23 The bending of a wave as it passes through an opening or passes a barrier.

28. #24 At the anti-node Standing Wave node Anti-node

29. #25 It is at the points where the waves intersect with the home or rest position

30. #26 It resonates meaning two objects that have the same frequency will vibrate together if one is already vibrating.

31. #27 The bridge was set in vibration by the elements of nature and once it began to resonate it began to tear apart.