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A person speaking normally produces sound should intensity of 40 dB at a distance of $1 m$ . If the threshold intensity for reasonable audibility is 20 dB, the maximum distance at which he can be heard clearly is:

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$4 m$

$5 m$

$10 m$

$20 m$

answer is C.

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Detailed Solution

$I = 10 \log \frac{I}{I_{0}}, I = \frac{p o w e r}{4 π r^{2}}$

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