The velocity of sound in moist air is more than in dry air because the moist air has
(1) less dense than dry air.
(2) less pressure than dry air.
(3) more pressure than dry air.
(4) more density than dry air.
Answer: (1) The density of dry air is more than that of moist air (when moisture is removed from the air, its density increases). The speed of sound in a medium is inversely proportional to the square root of its density. Therefore, the speed of sound in moist air is more than that in dry air.
