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2. 1. The source of all wave motion is a A. region of variable high and low pressure. B. movement of matter. C. harmonic object. D. vibration.

3. 2. The time needed for a wave to make one complete cycle is its A. frequency. B. period. C. velocity. D. amplitude. E. wavelength.

4. 3. The distance between successive identical parts of a wave is called its A. frequency. B. period. C. velocity. D. wavelength. E. amplitude.

5. 4. The hertz is a A. unit of frequency. B. special radio wave. C. type of car. D. unit of period. E. unit of wavelength.

6. 5. A man is standing on the shore of a beach, up to his knees in water. Every 2 seconds a wave breaks on him. What is the period of the wave? A. 2 waves per second B. 2 seconds C. 2 hertz D. 0.5 hertz

7. 6. A wave created by shaking a rope up and down is called a A. transverse wave. B. Doppler wave. C. standing wave. D. longitudinal wave. E. constructive wave.

8. 7. Where can you touch a standing wave on a rope without disturbing the wave? A. At a node B. At any place along the wave C. At an antinode

9. 8. Sound waves are A. transverse waves. B. longitudinal waves. C. circular waves. D. polarized waves.

10. 9. When two or more waves are at the same place at the same time, the resulting effect is called A. a Doppler wave. B. a shock wave. C. a period. D. interference.

11. 10. Water waves A. transport water but not energy. B. transport energy but not water. C. transport energy and water. D. are not mechanical waves.

12. 11. A singer can shatter a wine glass with his voice through A. resonance. B. frequency modulation. C. destructive interference. D. beats.

13. 12. When a sound source moves towards you, what happens to the wave speed? A. It stays the same. B. It decreases. C. It increases.

14. 13. Brianna is standing still and listening to a siren sounding an alarm. She begins running toward the sound. The frequency of the sound she hears will A. increase. B. remain the same. C. decrease.

15. 14. A sound wave that has a higher frequency has a wavelength that is A. longer. B. shorter.

16. 15. The frequency of the second hand on a clock is A. 60 hertz. B. 1/60 hertz. C. 1 hertz.

17. 16. Compared to the speed of light, sound travels A. at about the same speed. B. faster. C. slower.

18. 17. Sound waves in air are a series of A. high- and low-pressure regions. B. periodic disturbances. C. periodic compressions and rarefactions. D. all of the above E. none of the above

19. 18. Sound waves A. can travel in a vacuum. B. require a medium. C. are not mechanical waves. D. are unrelated to vibrations.

20. 19. The frequency of a sound wave determines A. how fast the sound travels. B. the magnitude of the compression. C. the pitch of the sound. D. how loud the sound is.

21. 20. Constructive interference occurs when A. two waves of the same color overlap. B. the crests of two waves overlap. C. the crest of one wave meets the trough of another wave. D. all of the above E. none of the above

22. 21. The intensity of a sound depends on A. the medium. B. the amplitude of the waves. C. the wavelength of the sound. D. the pitch of the sound.

23. 22. The speed of a sound wave is determined by the A. source of the wave. B. medium of the wave. C. frequency of the wave. D. amplitude of the wave.

24. 23. Which of the following would be most likely to transmit sound with the highest speed? A. Water in the ocean B. Steel in a bridge C. Water in a swimming pool D. Air in your classroom

25. 24. Resonance occurs when A. sound changes speed in going from one medium to another. B. an object is forced to vibrate at its natural frequency. C. sound makes multiple reflections. D. the amplitude of a wave is amplified. E. all of the above

26. 25. Noise-canceling earphones are an example of A. beats. B. resonance. C. destructive interference. D. constructive interference.

27. 26. What is the period of a sound wave that has a frequency of 80 Hz?

28. 27. What is the speed of a wave that is 0.5 m long and a frequency of 658 Hz?

29. 28. A sound wave has a wavelength of 8 m. If its speed is 340 m/s, what is its frequency?

30. 29. Explain the difference between mechanical waves and electromagnetic waves and give an example of each. (about 4 sentences)

31. A mechanical wave is a disturbance in matter and cannot travel through a vacuum. Sound, water waves and a vibrating guitar string are all examples of mechanical waves. An electromagnetic wave is made of vibrating electric and magnetic fields and can travel through a vacuum. Light, radio waves and microwaves are all examples of electromagnetic waves.