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The ratio of the velocity of sound in hydrogen $(γ = \frac{7}{5})$ to that in helium $(γ = \frac{5}{3})$ at the same temperature is

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Correct option is C

Velocity of sound in gasv=γRTMwhere the symbols have their usual meanings.At the same temperature,v∝γM ∴vH2vHe=γH2γHe×MHeMH2=75×35×42=425

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The ratio of the velocity of sound in hydrogen γ=75 to that in helium γ=53 at the same temperature is

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The ratio of the velocity of sound in hydrogen $(γ = \frac{7}{5})$ to that in helium $(γ = \frac{5}{3})$ at the same temperature is