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The r.m.s velocity of gas molecules is 3...

The r.m.s velocity of gas molecules is `300 ms^-1` The r.m.s velocity of molecules of gas with twice the molecular weight and half the absolute temperature is

A

`300 ms^-1`

B

`600 ms^-1`

C

`75 ms^-1`

D

`150 ms^-1`

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