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A source of sound waves is isotropic, and emits a constant power P. You stand an...

A source of sound waves is isotropic, and emits a constant power P. You stand an unknown distance, r, from this source and measure the sound level to be 75.0 dB. You move 10.0 m closer to the source and measure the sound level to be 80.0 dB.
a) Calculate P and r.

b) with the same source and the same power output. You begin at the same distance, r, from this source and measure the sound level to be 75. dB. How far along along a line that is 45 degrees from the line directly towards the source should you move so that the sound level is 80.0 dB?

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