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1. What is the wavelength of a 5 Hz wave that travels with a speed of 10 m/s ?

A. 0.25 mB. 0.5 mC. 1 mD. 2 mE. 50 m

2. A rope of length 5 m is stretched to a tension of 80 N. If its mass is 1 kg, at what speed would a 10 Hz transverse wave travel down the string?

A. 2 m/sB. 5 m/sC. 20 m/sD. 50 m/sE. 200 m/s

3. A transverse wave on a long horizontal rope with a wavelength of 8 m travels at 2 m/s. At t = 0, a particular point on the rope has a vertical displacement of +A, where A is the amplitude of the wave. At what time will the vertical displacement of this same point on the rope be –A ?

A. t = sB. t = sC. t = sD. t = 2 sE. t = 4 s

4. What is the wavelength of a wave with period 2 s and speed 2 cm/s ?

A. 0.25 cmB. 0.5 cmC. 1 cmD. 2 cmE. 4 cm

5. A string, fixed at both ends, supports a standing wave with a total of 4 nodes. If the length of the string is 6 m, what is the wavelength of the wave?

A. 0.67 mB. 1.2 mC. 1.5 mD. 3 mE. 4 m

6. A string, fixed at both ends, has a length of 6 m and supports a standing wave with a total of 4 nodes. If a transverse wave can travel at 40 m/s down the rope, what is the frequency of this standing wave?

A. 6.7 HzB. 10.0 HzC. 13.3 HzD. 20.0 HzE. 26.7 Hz

7. A sound wave travels through a metal rod with wavelength λ and frequency f. Which of the following best describes the wave when it passes into the surrounding air?

Wavelength Frequency

A. Less than λ Equal to fB. Less than λ Less than fC. Greater than λ Equal to fD. Greater than λ Less than fE. Greater than λ Greater than f

8. In the figure below, two speakers, S_{1} and S_{2}, emit sound waves of wavelength 2 m, in phase with each other.

Let A_{P} be the amplitude of the resulting wave at point P, and A_{Q} the amplitude of the resultant wave at point Q. How does A_{P} compare to A_{Q} ?

A. A_{p} < A_{Q}B. A_{p} = A_{Q}C. A_{p} > A_{Q}D. A_{p} < 0, A_{Q} > 0E. A_{p} and A_{Q} vary with time, so no comparison can be made.

9. An observer is 2 m from a source of sound waves. By how much will the sound level decrease if the observer moves to a distance of 20 m ?

A. 1 dBB. 2 dBC. 10 dBD. 18 dBE. 20 dB

10. An organ pipe that’s closed at one end has a length of 17 cm. If the speed of sound through the air inside is 340 m/s, what is the pipe’s fundamental frequency?

A. 250 HzB. 500 HzC. 1,000 HzD. 1,500 HzE. 2,000 Hz

11. A bat emits a 40 kHz “chirp” with a wavelength of 8.75 mm toward a tree and receives an echo 0.4 s later. How far is the bat from the tree?

A. 35 mB. 70 mC. 105 mD. 140 mE. 175 m

12. A car is traveling at 20 m/s away from a stationary observer. If the car’s horn emits a frequency of 600 Hz, what frequency will the observer hear? (Use v = 340 m/s for the speed of sound.)

A. (34/36)(600 Hz)B. (34/32)(600 Hz)C. (36/34)(600 Hz)D. (32/34)(600 Hz)E. (32/36)(600 Hz)