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:

  1. (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.