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Q.

In a mixture of gases, the average number of degree of freedom per molecule is 6. The rms speed of the molecules of the gas is C. the velocity of sound in the mixture of gases is

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a

3C4

b

C3

c

4C5

d

2C3

answer is B.

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Detailed Solution

Vrms=3RTM,Vs=rRTMVsVrms=r3 but r=1+2f=1+26=1+13=43
Thus,  Vs=Vrms49=C49=2C3

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