A point source emits sound equally in all dir | vedclass

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(A) The intensity $I$ of sound from a point source in a non-absorbing medium is inversely proportional to the square of the distance $r$ from the sour

Vedclass · Accepted Answer

$9:4$

Vedclass · Answer

(A) The intensity $I$ of sound from a point source in a non-absorbing medium is inversely proportional to the square of the distance $r$ from the source,given by $I \propto \frac{1}{r^2}$.Let $I_P$ and $I_Q$ be the intensities at points $P$ and $Q$ respectively.Given distances are $r_P = 2 \ m$ and $r_Q = 3 \ m$.Therefore,the ratio of intensities is $\frac{I_P}{I_Q} = \frac{r_Q^2}{r_P^2} = \left( \frac{3}{2} \right)^2 = \frac{9}{4}$.Thus,the ratio is $9:4$.

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

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