## PHYS 101 Quiz Waves and Sound

PHYS 101 Quiz: Waves and Sound

Module 6: Week 6

1. When a force F stretches a rope of mass per unit length ρ, the velocity of a wave in the rope is given by. You have two ropes of the same length. The mass of the second rope is twice the mass of the first rope. The velocity of a wave in the second rope is ___________ the velocity of a wave in the first rope.
2. Sound waves propagate in
3. When a force F stretches a rope of mass per unit length ρ, the velocity of a wave in the rope is given by you pull on a rope with a certain force, and a wave travels in the rope with a certain velocity. If you double your force, the velocity of a wave in the rope is now ____________ the original velocity.
4. Two sound waves traveling through the air have different frequencies. Consequently, they must also have different
5. Which of these shows one cycle of the wave?
6. A source emits sound at a fixed constant frequency f. If the temperature of the air rises, the frequency you hear is
7. Combining two sounds of equal intensity will give a sound level ___________ than the sound level due to just one of them.
8. In ultrasound the _____________ of the sound is much greater than in normal sound.
9. The distance between peaks on a wave divided by the time for the wave to travel this distance is the wave’s
10. If a source of sound is traveling toward you, the speed of the sound waves reaching you is _______________ the speed the sound waves would have had if the source were stationary.
11. You can hear sound through an open window from sources that are not in your line of sight because of
12. The wavelength of a wave multiplied by the frequency of the wave is the wave’s
13. What is meant by a wave medium?
14. The wavelength of the wave shown in this figure is about
15. An echo is a sound wave that has been
16. A sound wave in a metal bar is an example of a longitudinal wave.
17. When two identical waves arrive at the same place in phase, there is destructive interference.
18. The wavelength of a wave divided by the frequency of the wave is the wave’s speed.
19. In ultrasound the wavelength of the sound is much smaller than in normal sound.
20. Waves carry energy.
21. A source emits sound at a fixed constant frequency f. If the temperature of the air rises, the frequency you hear is higher than f.
22. As you move farther away from a source emitting a pure tone, the frequency of the sound you hear decreases.
23. For waves moving through the atmosphere at a constant velocity, higher frequency waves must have proportionally longer wavelengths.
24. A wave moves in a rope with a certain wavelength. A second wave is made to move in the same rope with twice the wavelength of the first wave. The frequency of the second wave is half the frequency of the first wave.
25. A water wave is an example of a transverse wave.
26. The speed of a wave is the frequency multiplied by the wavelength. If a 200Hz sound travels through the f use the given table of speeds of sound to determine the wavelength of sound:
27. Select the closest matching pairs possible. Amplitude Frequency Longitudinal Wave Wavelength Transverse Wave
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