Question

Which of the following statements are wrong about the velocity of sound in air :

• A. decreases with increases in temperature
• B. increases with decrease in temperature
• C. decreases as humidity increases
• D. independent of density of air

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A decreases with increases in temperature
B increases with decrease in temperature
C decreases as humidity increases
D independent of density of air

Velocity of sound and air is given by,
$v_{air}=\sqrt{\frac{{\gamma }_{air}RT}{M}}$ (option 'A' and 'B' are not true for sound of velocity in air)

$v_{water}=\sqrt{\frac{{\gamma }_{water}p}{\rho }}$ (option 'C' and 'D' are not true for sound of velocity in air as air has more weight than moist air for same density of molecules)

All are wrong.