The amplitude of acoustic pressure variation at a point 2 meters away from a gramophone playing music is ∆?max=0.02Pa The density of air is 1.2 kg/m3 , and the speed of sound is v = 343 m/s. a) What is the sound intensity at that point? b) What is the sound level? c) Assuming that the gramophone emits sound as a point source, what is the power output of the source?
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