53. If mass of He atom is 4 times that of hydrogen atom then mean velocity of He is
(a) 2 times of H-mean value
(b) 1/2 times of H-mean value
(c) 4 times of H-mean value
(d) Same as H-mean value
Answer-b
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a