A person speaking normally produces a sound intensity of 40 dB at a di – McqOptions

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1.	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 clearly is
A.	4 m
B.	5 m
C.	10 m
D.	20 m
Answer» D. 20 m

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