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- 1. Multiple Choice
Which best describes sound waves?
c. Positive displacement of particles
a. Transfer of energy from one place to another
b. Transfer of mass from one place to another
d. Movement in a direction perpendicular to the direction of the wave
- 2. Multiple Choice
Which statement is false, as suggested by the universal wave equation 𝑣 = 𝑓�
a. If the frequency is held constant, the speed increases as the wavelength increases.
b. Speed is the product of the frequency and the wavelength
c. If the wavelength is held constant, the speed increases as the frequency decreases. .
d. If the speed is held constant, wavelength increases as the frequency decreases
- 3. Multiple Choice
Which of the following actions will increase the speed of sound in air?
a. Decreasing the air temperature
b. Increasing the frequency of the sound
c. Increasing the air temperature
d. Increasing the amplitude of the sound wav
- 4. Multiple Choice
If one crest has a 3 cm amplitude and interacts with another wave to produce a crest 8 cm high this demonstrates:
a) constructive interference
b) destructive interference
c) Doppler Effect
d) a node
- 5. Multiple Choice
What will be the result if a crest with an amplitude of 30 cm overlaps a trough with an amplitude of 5.0 cm?
a) crest with an amplitude of 35 cm
b) trough with an amplitude of 35 cm
c) crest with an amplitude of 25 cm
d) trough with an amplitude of 25 cm
- 6. Multiple Choice
Two tuning forks of frequencies 3l0 and 3l6 Hz vibrate simultaneously. The number of times the resulting sound pulsates per second (beats) is:
a) 0
b) 6
c) 313
d) 626
- 7. Multiple Choice
Beats are the result of:
a) diffraction
b) constructive interference
c) destructive interference
d) both constructive and destructive interference
- 8. Multiple Choice
A dust particle is suspended in the air (floating) when a powerful loudspeaker plays a very low note. How will the dust particle move as a result of the speaker being turned on? (see diagram to the right)
a) The dust particle will move up and down
b) The dust particle will be pushed across the room.
c) The dust particle will move side to side.
d) The dust particle will move in a circular path. e) The dust particle will not move at all.
- 9. Multiple Choice
When a police car with its siren on is approaching you, the sound of the siren will be
a) slightly louder than normal.
b) slightly higher in pitch than normal.
c) slightly quieter than normal.
d) slightly lower in pitch than normal.
- 10. Multiple Choice
The amplitude of a sound wave corresponds to its:
a) pitch
b) loudness
c) frequency
d) resonance
- 11. Multiple Choice
A vibrating string completes 25 cycles in 100 s. What is the frequency of this vibration?
a) 0.25 Hz
b) 4.0 Hz
c) 2.5 kHz
d) 75 Hz
- 12. Multiple Choice
A vibrating object with a frequency of 200 Hz produces sound which travels through air at 360 m/s. What is the wavelength?
a) 0.9 m
b) 1.8 m
c) 3.6 m
d) 7.2 m
- 13. Multiple Choice
What is the amplitude of the illustrated wave?
a) 4.5 cm
b) 9.0 cm
c) 10 cm
d) 18 cm
- 14. Multiple Choice
A wave travels at 3100 m/s. If its wavelength is 6.0 m, what is its period?
- 15. Multiple Choice
If it takes 0.82 seconds for your voice to be heard by your friend standing 272 meters away, what is the temperature of the air?
5.17 ˚C
1.17 ˚C
1.34 ˚C
32.17 ˚C
- 16. Multiple Choice
When a tuning fork of unknown frequency is sounded simultaneously with a 512 Hz tuning fork, 20 beats are heard in 4.0 s. What are the possible frequencies of the unknown tuning fork?
517
507
107
205
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