(1) The noise level from a sewing machine was found to be 96 dB (lincar) at a distance of 1 metre. Find the sound power of the machine in picowatts. (Assume it is in a free field.) (2) A lighthouse has a foghorn with a sound power output of 100 watts. If it radiates over a quarter of a sphere, at what distance would the level be 100 dB? Why would a low-frequency horn be better than one of higher frequency?
(1) The noise level from a sewing machine was found to be 96 dB (lincar) at a distance of 1 metre. Find the sound power of the machine in picowatts. (Assume it is in a free field.) (2) A lighthouse has a foghorn with a sound power output of 100 watts. If it radiates over a quarter of a sphere, at what distance would the level be 100 dB? Why would a low-frequency horn be better than one of higher frequency?
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Transcribed Image Text:(1) The noise level from a sewing machine was found to
be 96 dB (lincar) at a distance of 1 metre. Find the
sound power of the machine in picowatts. (Assume
it is in a free field.)
(2) A lighthouse has a foghorn with a sound power output
of 100 watts. If it radiates over a quarter of a sphere,
at what distance would the level be 100 dB? Why
would a low-frequency horn be better than one of
higher frequency?
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