Problem

The faintest sound that can be heard has a pressure amplitude of about

2 \times 10^{-5}

m^2

and the loudest that can be heard without pain has a pressure amplitude of about 28 N/

m^2

. Assume an air density of 1.29 kg/

m^3

and a velocity of sound is 345 m/s. (a) the intensity of the sound both in W/

m^2

and in dB (b) the amplitude of the oscillations if the frequency is 500 Hz.