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chelsea123
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Homework Statement
1. Question : A point source emits 34.0 W of sound isotropically. A small microphone intercepts the sound in an area of 0.510 cm2, 185 m from the source. What is the sound intensity at that distance?
What is the power intercepted by the distance?
Homework Equations
I=P/a,P=IA
The Attempt at a Solution
so far i have gotten the intensity as I=P/A,
I=340W/(5.10*10^-3)+4pi(185)^2
I=7.91*10^-5 W/m^2
However for the second part of the question to calculate power, it is not correct. I use P=IA
with the same area but it will not work properly:
P=(7.91*10^-5W/m^2)(5.10*10^-3m2 + 4pi(185m)^2
P=34.0 W (which is incorrect)
Where is the flaw in this equation?