Sound Waves. Intensity and Sound Level

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Waves Learning Material
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Tutorial
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Revision
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11.5Sound Waves. Intensity and Sound Level

Physics Revision Questions for Sound Waves. Intensity and Sound Level

1. A person hears the thunder 2.6 s after seeing the flash of lightning. How far does the lightning occur? Take the speed of sound in air equal to 343 m/s.

  1. 891.8 m/s
  2. 445.9 m/s
  3. 1783.6 m/s
  4. 0

Correct Answer: A

2. What is the noise level caused by a source that emits sound of intensity equal to 5 × 10-7 W/m2.

  1. 140 dB
  2. 77 dB
  3. 70 dB
  4. 14 dB

Correct Answer: B

3. A sound wave has a frequency of 600 Hz and an amplitude of 4 cm. What are the new values of frequency and amplitude if pitch decreases by a factor of 5 and loudness increases by 10 times?

  1. Frequency = 24 Hz, Amplitude = 400 cm
  2. Frequency = 120 Hz, Amplitude = 40 cm
  3. Frequency = 3000 Hz, Amplitude = 0.4 cm
  4. Frequency = 15 000 Hz, Amplitude = 0.04 cm

Correct Answer: A

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