42. At a given temperature the ratio of r.m.s. velocities of hydrogen molecule and helium atom will be
(a) √2:1 (b) 1:√2
(c) 1 : 2 (d) 2 : 1
Answer-a
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a