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The speed of sound in a mixture of n1=2 ...

The speed of sound in a mixture of `n_1=2` moles of He , `n_2=2` moles of `H_2` at temperature `T=972/5 K` is `etaxx10m//s`.Find `eta`.(Take `R=25/3J` /mole-K)

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The correct Answer is:
90
`v=sqrt((gammaRT)/(M))`
`M=(4xx2+2xx2)/(4)=3g`
`gamma=1+(2)/(f)=1+(2xx(2+2))/(2xx3+2xx5)=(3)/(2)`
`:. v=sqrt((3)/(2)xx(35)/(3)xx(1000)/(3)xx(972)/(5))=900m//s`
`Ans. 90`
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