Question

which of the following would not increase the velocity of a sound wave in air? a) increasing the temperature of the air b) lowering the humidity of the air c) increasing the wind speed in the

Explanation:

To determine which option does not increase sound velocity in air:

• Option A: Sound speed in air increases with temperature (since higher temp means faster - moving air molecules, aiding sound propagation).
• Option B: Humid air has more water vapor (less dense than dry air). Sound travels faster in less - dense, humid air. So lowering humidity (making air “drier”/more dense) decreases sound velocity (or at least does not increase it).
• (For completeness, wind speed (Option C, partially shown) can increase sound velocity if wind moves in the direction of sound propagation.)

Answer:

B) Lowering the humidity of the air