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SHM expression

A point sourc...

Question

A point source emits sound equally in all directions in a non absorbing medium. Two points P and Q are at distances of $9$ m and $25$ m respectively from the source. The ratio of the amplitudes of the waves at P and Q is?

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Solution

The amplitude of sound is inversely proportional to Distance.
$A α \frac{1}{r}$
Therefore, the ratio of amplitude is, $\frac{A_{1}}{A_{2}} = \frac{25}{9}$

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