Question

The ratio of velocity of sound in air at 4 atmospheric pressure and that at 1 atmospheric pressure would be :

• A. 2:1
• B. 1:2
• C. 1:1
• D. 1:4

Answer 1

Answer: (C)

1:1

Answer is C.
It is a wrong assumption that the speed of sound decreases with altitude above sea level, because the density of air decreases with height. The changing of atmospheric pressure does not change the speed of sound.
Hence, the speed of sound remains the same irrespective of the pressure levels. The ratio in this case is as 1:1.