43. Velocity of sound in air does not change with the change of A.Temperature of air B.Pressure of air C.Moisture content in air D.Wind in the direction of propagation of sound
Option B Solution: Air pressure has no effect at all in an ideal gas approximation. This is because pressure and density both contribute to sound velocity equally, and in an ideal gas the two effects cancel out, leaving only the effect of temperature. Sound usually travels more slowly with greater altitude, due to reduced temperature.
