A point source emits sound equally in all directions in a non-absorbing medium. Two points `P` and `Q` are at the distance of `9 meters` and 25 meters respectively from the source. The ratio of amplitudes of the waves at `P` and `Q` is…..

Answer

B

Explanation

`(I_1)/(I_2)=(A_1^2)/(A_2^2)` ….(i)
But `I implies (I_1)/(I_2)=(r_2^2)/(r_1^2)` …(ii)
From (i) and (ii) ,
`(A_1)/(A_2)=(r_2)/(r_1)=(25)/(9)`.