The speed of a certain compressional wave in air at standard temperature and pressure is \( 330 ...

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The speed of a certain compressional wave in air at standard temperature and pressure is \( 330 \mathrm{~m} / \mathrm{s} \). A point source of frequency \( 300 \mathrm{~Hz} \) radiates energy uniformly in all directions at the rate of 5 Watt.
(a) What is the intensity of the wave at a distance of \( 20 \mathrm{~m} \) from the source?
(b) What is the amplitude of the wave there? [Density of air at \( \mathrm{STP}=1.29 \mathrm{~kg} / \mathrm{m}^{3} \) ]
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