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The source of a sound wave has a power of2.50 µW. Assume it is a pointsource.
(a) What is the intensity 7.00 m away?
W/m2
(b) What is the sound level at that distance?
dB
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One cubic meter (1.00m^3) of concrete has a mass of 2.30E+3kg, and 1.00m^3 of copper has a mass of 8.92E+3kg. Find the radius of an concrete sphere whose mass is the same as that of an copper sphere of radius 1.28cm?
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