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Chapter 12: Sound

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Physics Principles with Applications
Pages: 328 - 358
Physics Principles with Applications

Physics Principles with Applications

Book edition 7th
Author(s) Douglas C. Giancoli
Pages 978 pages
ISBN 978-0321625922

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Illustration

114 Questions for Chapter 12: Sound

  1. A noisy truck approaches you from behind a building. Initially you hear it but cannot see it. When it emerges and you do see it, its sound is suddenly “brighter”—you hear more of the high-frequency noise. Explain. [Hint: See Section 11–14 on diffraction.]

    Found on Page 328

  2. A fish finder uses a sonar device that sends 20,000 Hz sound pulses downward from the bottom of the boat, and then detects echoes. If the maximum depth for which it is designed to work is 85 m, what is the minimum time between pulses (in fresh water)?

    Found on Page 328

  3. A single mosquito 5.0 m from a person makes a sound close to the threshold of human hearing (0 dB). What will be the sound level of 200 such mosquitoes?

    Found on Page 328

  4. What is the resultant sound level when an 81 dB sound and an 87 dB sound are heard simultaneously?

    Found on Page 328

  5. The sound level 8.25 m from a loudspeaker, placed in the open, is 115 dB. What is the acoustic power output (W) of the speaker, assuming it radiates equally in all directions?

    Found on Page 328

  6. A stereo amplifier is rated at 225 W output at 1000 Hz. The power output drops by 12 dB at 15 kHz. What is the power output in watts at 15 kHz?

    Found on Page 328

  7. What is the evidence that sound travels as a wave?

    Found on Page 328

  8. What is the evidence that sound is a form of energy?

    Found on Page 328

  9. Found on Page 328

  10. When a sound wave passes from air into water, do you expect the frequency or wavelength to change?

    Found on Page 328

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