A sound wave propagates in air with density p = 1.225 kg/m³. With sensitive diagnostics, it was measured that the sound wave causes an increase in temperature, T = 8.1 × 10â»Â³ K, and velocity V = 0.024 m/s. Find the change in density, in kg/m³, and in pressure p, in Pa, across the sound wave, and also the speed of the wave c, in m/s.