The speed of a certain compressional wave in air at standard temperature and pressure is 330 m/s. A point source of frequency 300 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 m from the source?
(b) What is the amplitude of the wave there? [Density of air at STP = 1.29 kg/m3 ]