(3) Propagation of sound in air can be considered as adiabatic process, and the speed of sound is given by dp v = dp (a) Describe why propagation of sound can be approximated as adiabatic process. (b) Calculate the speed of sound at 1 atm at 15°C. You may use average molecular weight of air m = 29 [g/mol], and specific heat ratio of air y = 1.4.

(3) Propagation of sound in air can be considered as adiabatic process, and the speed of sound is given by dp v = dp (a) Describe why propagation of sound can be approximated as adiabatic process. (b) Calculate the speed of sound at 1 atm at 15°C. You may use average molecular weight of air m = 29 [g/mol], and specific heat ratio of air y = 1.4.