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Question

Intensity of sound at a point is_______ its distance from the source.
  1. directly proportional to
  2. directly proportional to square of
  3. inversely proportional to
  4. inversely proportional to square of

A
inversely proportional to square of
B
inversely proportional to
C
directly proportional to
D
directly proportional to square of
Solution
Verified by Toppr

Intensity of a point source of sound at a point is given by ,
I=Power/4πr2 ,
where , r= distance of point from the source of sound ,
it is clear that ,
I1/r2

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