Speed of sound is fast in moist air because:
Correct answer: C. Density of moist air is less than density of dry air
- A. Moist air is heavier than dry air
- B. Value of gamma is more for moist air
- C. Density of moist air is less than density of dry air
- D. Density of moist air is more than density of dry air
Explanation
The speed of sound in dry air is 340m/s whereas the speed of sound in moist air is 346m/s. Keep in mind that the water vapour is lighter than dry air. As we remove the moisture from air, then its density increases and the speed of sound in moist air is inversely proportional to the root of its density.
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