PHYSICS
JAMB 2010 - Question 27
Physics 2010 JAMB Past Questions - Question 27: The velocity of sound in the air at 16°C is 340ms¹What will it be when the pressure is doubled and its temperature raised to 127°C?
Choose the correct answers from the options given.
A:
B:
C:
D:
Correct Answer
D
Explanation
The velocity of sound in air, V∝√T, 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/√T1 = V2/√T2
T1 = 16 + 273 = 289K, V1 = 340ms-1
T2 = 127 + 273 = 400K, V2 = ?
340 = V2
√289 √400
∴ V2 = 340√400
_√289
= 400m/s
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