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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

The intensity level produced by a jet airplane at a certain location is 150 dB. (a) Calculate the intensity of the sound wave generated by the jet at the given location. (b) Compare the answer to part (a) to the threshold of pain and explain why employees directing jet airplanes at airports must wear hearing protection equipment.

(a)

To determine
The sound intensity generated by a jet airplane.

Explanation

Given Info: The intensity level of sound is 105 dB and reference intensity is 1.00×1012W/m2

Formula for intensity level of a sound,

β=10log(II0)

  • I0 is reference intensity.
  • I is the intensity of a sound.

Rearrange the expression in terms of I .

I=I010β10

Substitute 155 dB for β and 1.00×1012W/m2 for  I0 in the above expression to get I

(b)

To determine
Why the employees directing jet airplanes at airports must wear hearing protection equipment.

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