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The rate of effusion of two gases 'a' an...

The rate of effusion of two gases `'a'` and `'b'` under identical conditions of temperature and pressure are in the ratio of `2:1` What is the ratio of `rms` velocity of their molecules if `T_(a)` and `T_(b)` are in the ratio of `2:1`?

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`2 sqrt2 : 1`
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