STANDARDPhysics-Waves
STANDARD Physics Sound Waves MCQ Question
Type: MCQ-conceptual-Medium-Class 11
The ratio of the velocity of sound in hydrogen (γ = 7/5) to that in helium (γ = 5/3) at the same temperature is
A
√(5/42)
B
√(5/21)
C
√(42/5)
D
√(21/5)
Correct Answer
Option C
Detailed Explanation
Velocity of sound in gas is given by v = √(γRT/M). At the same temperature, v ∝ √(γ/M). For hydrogen and helium, the ratio becomes √(7/5 × 3/4) = √(42/5).
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