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College Physics

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

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BuyFindarrow_forward

College Physics

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

A family ice show is held at an enclosed arena. The skaters perform to music playing at a level of 80.0 dB. This intensity level is too loud for your baby, who yells at 75.0 dB. (a) What total sound intensity engulfs you? (b) What is the combined sound level?

(a)

To determine
The total intensity of the sound engulfing you.

Explanation

Given Info: The intensity level of music is 80 dB, intensity level of baby is 75dB and reference intensity is 1×1012W/m2

Formula to calculate sound intensity,

β=10log(II0)

  • I0 is reference intensity,
  • I is the total intensity,

Rearrange the expression in terms of I .

I=I010β10

Formula for total intensity of sound engulfing you,

I=I010βmusic10+I010βbaby10=I0(10βmusic10+10βbaby10)

  • βbaby is the sound level of baby

(b)

To determine
The combined sound level.

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