Wave Mechanics Question 57
Velocity of sound in air is approximately 343 meters per second at 20°C.
[Pb. PMT 1999; UPSEAT 2000]
Options:
A) Faster in dry air than in moist air
B) Directly proportional to pressure
C) Directly proportional to temperature
D) Independent of air pressure
Show Answer
Answer:
Correct Answer: D
Solution:
$ v=\sqrt{\frac{\gamma ,P}{\rho }} $ ; as P changes, r also changes. Hence $ \frac{P}{\rho } $ remains constant so speed remains constant.
BETA
