Problem: A surface receiving sound is moved from its original position to a position three times farther away from the source of the sound. The intensity of the received sound thus becomes A. nine times as low. B. nine times as high. C. three times as high. D. three times as low. 

FREE Expert Solution

Intensity, I = P/4πr2 

The source intensity:

I1 = r1

The received intensity:

I2 = r2 = 3r1

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Problem Details

A surface receiving sound is moved from its original position to a position three times farther away from the source of the sound. The intensity of the received sound thus becomes 

A. nine times as low. 

B. nine times as high. 

C. three times as high. 

D. three times as low.