A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distances of 2m and 3m respectively from the source. The ratio of the intensities of the waves at P and Q is 

(1) 9 : 4

(2) 2 : 3

(3) 3 : 2

(4) 4 : 9

(1) Intensity 1(Distance)2

I1I2=d2d12=322=94.

Difficulty Level:

  • 60%
  • 22%
  • 10%
  • 10%