Answer to Question #68834 in Electricity and Magnetism for Chloe

Question

If the power of a source remains constant, by what factor does the intensity of sound change if an observer moves 4 times as far from the source. No units required.

Answer 1

The intensity depends on distance as r^(−2). Hence, if you increase distance in 4 times, the intensity decrease in 4^2 = 16 times.