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An electronic point source emits sound isotropically at a frequency of 2 × 103 Hz and...

An electronic point source emits sound isotropically at a frequency of 2 × 103 Hz and a power of 29 watts. A small microphone has an area of 0.72 cm2 and is located 150 meters from the point source.

1)
What is the sound intensity at the microphone ?
I =

2)
What is the power intercepted by the microphone?
Pin =

3)
How many minutes will it take for the microphone to recieve 0.2 Joules from this sound?
ΔT =

4)
What is the sound intensity level at the microphone from this point source?
Β =

5)
What would be the sound intensity level at the microphone if the point source doubled its power output?
Β =

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