1. A car moving at 35 m/s approaches a stationary whistle that emits a 220 Hz sound. The speed of sound is 343 m/s. What is the frequency of sound heard by the driver of the car?

A. 282 Hz

B. 220 Hz

C. 198 Hz

D. 245 Hz

E. 340 Hz

2. Two loudspeakers are located 3.0 m apart on the stage of an auditorium. A listener at point P is seated 19.0 m from one speaker and 15.0 m from the other. A signal generator drives the speakers in phase with the same amplitude and frequency. The wave amplitude at P due to each speaker alone is A. The frequency is then varied between 30 Hz and 400 Hz. The speed of sound is 343 m/s. At what frequency or frequencies will the listener at P hear a maximum intensity?

A. 57 Hz, 114 Hz, 171 Hz, 228 Hz, 285 Hz, 342 Hz, and 399 Hz

B. 86 Hz, 170 Hz, 257 Hz, and 343 Hz

C. 43 Hz, 85 Hz, 128 Hz, 170 Hz, 213 Hz, 257 Hz, 298 Hz, 344, and 387 Hz

D. 113 Hz and 226 Hz

E. 170 Hz only

3. A rope of length L is clamped at both ends. Which one of the following is not a possible wavelength for standing waves on this rope?

A. 4L

B. L/2

C. L

D. 2L/3

E. 2L

4. A guitar string produces 4 beats/s when sounded with a 250 Hz tuning fork and 9 beats per second when sounded with a 255 Hz tuning fork. What is the vibrational frequency of the string?

A. 254 Hz

B. 259 Hz

C. 263 Hz

D. 246 Hz

E. 240 Hz

5. A transverse periodic wave on a string with a linear density of 0.200 kg/m is described by the following equation: y = 0.08 sin(469t - 28.0x), where x and y are in meters and t is in seconds. What is the tension in the string?

A. 65.8 N

B. 56.1 N

C. 32.5 N

D. 3.99 N

E. 79.9 N

6. Which one of the following statements concerning waves is false?

A. A wave carries energy from one place to another.

B. A wave can have both transverse and longitudinal components.

C. A wave is traveling disturbance.

D. A transverse wave is one in which the disturbance is parallel to the direction of travel.

E. A wave does not result in the bulk flow of the material of its medium.

7. Castor oil has a density of 956 kg/m3. If the speed of sound in castor oil is 1474 m/s, what is its adiabatic bulk modulus? [Note 1.2 x 10^2 N/m2 = 120 N/(square meter)]

A. 5.71 x 10^9 N/m2

B. 1.77 x 10^9 N/m2

C. 2.08 x 10^9 N/m2

D. 9.22 x 10^9 N/m2

E. 8.90 x 10^9 N/m2

8. A pebble is dropped in a lake; and it produces ripples with a frequency of 0.50 Hz. When should a second pebble be dropped at the same place to produce destructive interference?

A. 2.0 s after the first

B. 0.50 s after the first

C. 0.75 s after the first

D. 1.0 s after the first

E. 1.5 s after the first

9. A speaker is designed for wide dispersion for a high frequency sound. What should the diameter of the circular opening be for a speaker where the desired diffraction angle is 11 degrees and a 9100 Hz sound is generated? The speed of sound is 343 m/s.

A. 0.24 m

B. 0.13 m

C. 0.048 m

D. 0.039 m

E. 0.077 m

10. Which one of the following super positions will result in beats?

A. The superposition of waves that are identical except for slightly different amplitudes

B. The superposition of identical waves that travel in the same direction.

C. The superposition of waves that are identical except for slightly different frequencies

D. The superposition of waves that travel with different speeds

E. The superpositions of identical waves that travel in opposite directions

11. The tension in a taut rope is increased by a factor of 9. How does the speed of wave pulses on the rope change, if at all?

A. The speed is increased by a factor of 9.

B. The speed is reduced by a factor of 9.

C. The speed is increased by a factor of 3.

D. The speed remains the same.

E. The speed is reduced by a factor of 3.

12. A wave has a frequency of 58 Hz and a speed of 31 m/s. What is the wavelength of this wave?

A. 1.9 m

B. .29 m

C. 0.53 m

D. 31 m

E. 3.5 m

13. At distance of 5.0 m from a point sound source, the sound intensity level is 110 dB. At what distance is the intensity level 95 dB?

A. 7.1 m

B. 14 m

C. 42 m

D. 28 m

E. 5.0 m

14. Two canoes are 10 m apart on a lake. Each bobs up and down with a period of 8.0 seconds. When one canoe is at its highest point, the other canoe is at its lowest point. Both canoes are always within a single cycle of the waves. Determine the speed of the waves.

A. 1.3 m/s

B. 5.0 m/s

C. 2.5 m/s

D. 0.75 m/s

E. 0.65 m/s

15. Pipe A is 0.50 m long and open at both ends. Pipes B is open at one end and closed at the other end. Determine the length of pipe B so that it has the same fundamental frequency as A.