question_answer 30)

                  Speed of sound wave in air                 (a) is independent of temperature.                 (b) increase with pressure.                 (c) increases with increase in humidity.                 (d) decreases with increase in humidity.

Answer:

                  (c) Humidity decreases the density of air. Since \[\upsilon \,\propto \,\frac{1}{\sqrt{\rho }}\]. Therefore, \[\upsilon \] increases with increase in humidity.