Question

A point source of the sound is placed in a non-absorbing medium.. This source is at a distance of 4 m and 8 m from the point A and B respectively. Find the ratio of amplitude of this wave at A and B.

• A. 1:2
• B. 2:4
• C. 2:1
• D. 1:1

Answer 1

The correct option is C 2:1

since for the point source, the amplitude at a point is inversionally proportional to the distance from the point from the source.

so amplitude (A) at ,

$\frac{A_A}{A_B}=\frac{d_A}{d_B}=\frac{8}{4}=\frac{2}{1}$

so the answer is C.