- #1
Zdub311
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Homework Statement
A loudspeaker emits sound isotropically with a power of 100db. Find the intensity in w/m at a distance of 20 from the source
Homework Equations
Intensity=power/area, For sound wave... power=ro*a*2pi^2*f^2*v*A^2, and I=2pi^2*ro*f^2*v*A^2.
db=10log_10_(I/I_0_)
Also, the teacher wants us to use calculus in the answers, but in our book i found some easier equations for the question, I just don't if that's what he's looking for with how to solve it. Anyways, they are...
I=P/4pir^2,
The Attempt at a Solution
I've tried solving it using each of these equations...