If the distance from a point source of sound is doubled, by what factor does the intensity decrease?
A. 4.00 B. 2.00 C. 0.50 D. 0.25
Correct Answer: A
Explanation
In general intensity of a wave is the rate of flow of energy across unit area normal to the direction of propagation of the wave intensity α1/r2 where r is the distance away from the point source. Thus if the distance from the point source of the sound wave is doubled, then the intensity will be decreased by a factor of 4
