# physics

posted by Anonymous

Posted by Anonymous on Tuesday, December 2, 2008 at 12:43am.

A loudspeaker is placed between two observers who are 114 m apart, along the line connecting them. If one observer records a sound level of 61.6 dB and the other records a sound level of 81.3 dB, how far is the speaker from each observer?

Responses

physics - drwls, Tuesday, December 2, 2008 at 2:14am
Get the intensity ratio from the decibel difference, and apply the inverse square law so that the ratio of distances squared are the inverse ratio of the intensities.

physics - HELP - Anonymous, Tuesday, December 2, 2008 at 11:17am

intensity ratio = 19.7dB

I=1/r^2
r^2 = 1/19.7
r = .225m

this doesn't make sense
what am i doing wrong?

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