If the distance from a point source of sound is doubled, by what factor does…

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: Option 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

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