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24. The respective speeds of the molecules are 1, 2, 3, 4 and 5 km/sec. The ratio of their r.m.s. velocity and the average velocity will be

(a) √11 :3                                          (b) 3:√11

(c)   1 : 2                                          (d)  3 : 4

Answer-a

(3)

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