Sound Intensity of a Whisper?

by kristibella
Tags: intensity, sound, whisper
kristibella is offline
Nov19-08, 07:14 PM
P: 18
1. The problem statement, all variables and given/known data
A. What is the sound intensity of a whisper at a distance of 3.5 m, in W/m2?
I know that a whisper is approximately 20 dB and P = 10-10 W/m2.

B. What is the corresponding sound intensity level in dB?

2. Relevant equations
I = Power/[(4pi)(3.5m)2)
dB = 10 log (I/Io).

3. The attempt at a solution
I = 6.50*10-13

dB = -1.87 (I used 10-12 W/m2 for Io)
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Redbelly98 is offline
Nov20-08, 02:59 PM
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P: 11,989
Quote Quote by kristibella View Post
I know that a whisper is approximately 20 dB and P = 10-10 W/m2.
dB level would depend on how far away you are. You know it's 20 dB at what distance from the whisperer?

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