Note: Use the following values as needed unless otherwise
specified: the equilibrium density of air at 20°C is
! # 1.20 kg/m3. The speed of sound in air is v #
343 m/s. Pressure variations 'P are measured relative
to atmospheric pressure, 1.013 & 105 N/m2.
Problem 70 in Chapter 2 can also be assigned with this
section.