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The rms speed of helium gas at 27^(@)C a...

The rms speed of helium gas at `27^(@)C` and 1 atm pressure is `900ms^(-1)`. Then the rms speed of helium molecules at temperature `27^(@)C` and 2 atm presure is

A

`450m//s`

B

`900m//s`

C

`1800m//s`

D

`750 m//s`

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