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The molecular weights of hydrogen and he...

The molecular weights of hydrogen and helium are respectively 2 and 4. The temperature at which the heliwn molecules will have half the R.M.S. velocity as that of hydrogen molecules at N.T.P. is

A

`273^(@)C`

B

365.1 K

C

546 K

D

`137K

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The correct Answer is:
D
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