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Three foot balls are respectively filled...

Three foot balls are respectively filled with nitrogen, hydrogen and helium. If the leaking of the gas occurs with time from the filling hole, then the ratio of the rate of leaking of gases `(r _(N _(2) ) : r _(H _(2)) : r _(H e ))` from three foot balls is

A

` 1 : sqrt14 : sqrt7`

B

`sqrt14 : sqrt7 :1`

C

`sqrt7: 1: sqrt14`

D

`1: sqrt7 : sqrt14`

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