The ratio of the speed of sound in hydro...

The ratio of the speed of sound in hydrogen gas `(lambda=frac(7)(5))` to helium gas `(lambda=frac(5)(3))` at same temperature is

`frac(sqrt(34))(5)`

`frac(sqrt7)(5)`

`frac(sqrt(42))(5)`

`frac(sqrt(21))(5)`

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