A jet plane at take-off can produce sound of intensity 9.20W/m2 at 30.0 m away.

Question

A jet plane at take-off can produce sound of intensity 9.20W/m2 at 30.0 m away. But you prefer the tranquil sound of normal conversation, which is 1.0 muW/m2 Assume that the plane behaves like a point source of sound. What is the closest distance you should live from the airport runway to preserve your peace of mind? Express your answer using two significant figures. What intensity from the jet does your friend experience if she lives twice as far from the runway as you do? Express your answer using two significant figures. What power of sound does the jet produce at take-off? Express your answer using two significant figures. Not quite. Check through your calculations: you may have made a rounding error or used the wrong number of significant figures. Not quite. Check through your calculations: you may have made a rounding error or used the wrong number of significant figures. Not quite. Check through your calculations: you may have made a rounding error or used the wrong number of significant figures.

Explanation / Answer

part C)

Apply, Inetsity = power/Area

I = P/(4*pi*r^2)

==> P = I*4*pi*r^2

= 9.2*4*pi*30^2

= 104049.55 Watts

in the answer use two significant figures.

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