the maximum distance at which he can be hear clearly is

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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 hear clearly is
14
Sep
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 hear clearly is A person speaking normally produces a sound intensity of 40 dB at a distance of 1 m. [...]
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