markcardenas97891 markcardenas97891

16-02-2024
Physics

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A person speaking normally produces a sound of intensity 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

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