If the mass of He is 4 times that of hydrogen, then mean velocity of He at the same temperature ...

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If the mass of He is 4 times that of hydrogen, then mean velocity of He at the same temperature is
(a) 2 times of \( \mathrm{H} \)-mean value
(b) \( (1 / 2) \) times of \( \mathrm{H} \)-mean value
(c) 2 times of \( \mathrm{H} \)-mean value
(d) same as H-mean value
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