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Which is not the correct reason for sound of speed being higher in helium than in air at the same temperature?

Which is not the correct reason for sound of speed being higher in helium than in air at the same temperature? Correct Answer Gas constant is same for both

The sound of speed depends on gamma, T and the gas constant R for the respective gas. In case of helium and air, the gamma for helium is higher than air. Also, helium is lighter than air thus, R for helium being higher. This gives, at the same temperature, speed of sound more in helium than air.

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