Mrs. mason does not want the ringing of the telephone to water up her baby. which of the following would produce the greatest reduction of noise from the ringing of the telephone

what's the

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.