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Question

The velocity of sound in oxygen is less than in helium.

A
True
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B
False
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Solution

The correct option is A True
Formula for Velocity of Sound in a Gas is; v=(γRT/M)1/2, where γ is adiabatic index of gas, R and T are universal gas constant and temperature of gas and M is the molecular weight of gas.
Now, γo=7/5 and of γhe=5/3
Also, Mo=32 and that of MHe=4
so, byputting known values in velocity formula we get;
Velocity of sound in Oxygen is less than in Helium.

Hence, the given statement is True

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