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A person speaking normally produces a so...

A person speaking normally produces a sound 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 cleary is.

A

4m

B

5 m

C

10 m

D

20 m

Text Solution

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The correct Answer is:
B
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