THe velocity of sound in air at 16oC is 340ms-1. What will it be when the pressure is doubled and its temperature raised to 127oC?
A. 400 ms-1 B. 4,000 ms-1 C. 8,000 ms-1 D. 160,000 ms-1
Correct Answer: A
Explanation
The velocity of sound in air, VâˆâˆšT, where T is absolute temperature Thus V = K√T or K = V/T V is independent of pressure and density at a fixed temperature. ∴ V1/√T[sub]1[/sub] = V2/√T[sub]2[/sub] T1 = 16 + 273 = 289K, V1 = 340ms-1 T2 = 127 + 273 = 400K, V2 = ?
