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The rms speed of the molecules of a gas ...

The rms speed of the molecules of a gas in a vessel Is `400 ms^-1`. If half of the gas leaks out at constant temperatuare, the rms speed of the remaining molecules will be

A

`800 ms^-1`

B

`400sqrt2 ms^-1`

C

`400 ms^-1`

D

`200 ms^-1`

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