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The ratio of the speed of sound in nitrogen gas to that in helium gas, at 300K is

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The ratio of the speed of sound in nitrogen gas to that in helium gas, at 300K is
A. `sqrt((2//7))`
B. `sqrt((1//7))`
C. `(sqrt(3))//5`
D. `(sqrt(6))//5`
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Correct Answer - B
`((C)N_(2))/((C)He) = sqrt((M_(He))/(M_(N_(2)))) = sqrt((4)/(28)) = sqrt((1)/(7))`.
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