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  4. The sound intensity level at a point 4 m from the point source is 10 dB, then the sound level at a distance 2 m from the same source will be

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Q. The sound intensity level at a point $4\, m$ from the point source is $10 \,dB$, then the sound level at a distance $2 \,m$ from the same source will be

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Solution:

$I \propto \frac{1}{r^{2}}$
$\therefore $ If at two $m$ intensity is $I_{1}$ at $4\, m$,
intensity is $\frac{I_{1}}{4}$