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 –
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A
The average power per unit area that is incident perpendicular to the direction of propagation is called the intensity.
Intensity of sound
Here, 
Substituting the values, we have
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