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The root mean square velocity of the mo...

The root mean square velocity of the molecules in a sample of helium is (5/7)th that of the molecules in a sample of hydrogen.. If the temperature of the hydrogen sample is at `0^@C` then the temperature of helium sample will be

A

`278.46^@ K`

B

`5.46^@C`

C

`273^@K`

D

a' and 'b'

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