College Physics

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



College Physics

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

A person wears a hearing aid that uniformly increases the intensity level of all audible frequencies of sound by 30.0 dB. The hearing aid picks up sound having a frequency of 250 Hz at an intensity of 3.0 × 10−11 W/m2. What is the intensity delivered to the eardrum?

To determine
The intensity level delivered to eardrum.


Given Info: The intensity of a hearing is 3×1011W/m2 , Intensity level of audible frequency of sound is 30 dB and hearing frequency is 250 Hz.

Formula to calculate the difference in decibel level of two sounds is,


  • β2β1 is the difference in the decibel leave.
  • I2 is the intensity delivered to the eardrum,
  • I1 is the intensity of a hearing,
  • I0 is the reference intensity.

Simplify the above expression


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