Waves - Result Question 20
20. What is the effect of humidity on sound waves when humidity increases?
[1996]
(a) speed of sound waves is more
(b) speed of sound waves is less
(c) speed of sound waves remains same
(d) speed of sound waves becomes zero
Show Answer
Answer:
Correct Answer: 20. (a)
Solution:
- (a) Velocity of sound $=\sqrt{\frac{\gamma R T}{M}}$
When water vapour are present in air, average molecular weight of air decreases and hence velocity increases.
