1.

The ratio of the velocity of sound in Hydrogen gas `(gamma=7/5)` to that in Helium gas `(gamma=5/3)` at the same temperature is `sqrt(21/3)`.

Answer» `v_("sound") = sqrt((gamma RT)/(M))`
`(v_(H_(2)))/(v_(He)) = sqrt((gamma_(H_(2))//M_(H_(2))))/(sqrt(gamma _(He)//M_(He))) = sqrt((7//5)//2)/(sqrt((5//3)//4)) =sqrt((42)/(25))`.


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