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54. The r.m.s. speed of a group of 7 gas molecules having speeds (6, 4, 2, 0, – 2, – 4, – 6) m/s is

(a)  1.5 m/s                              (b)  3.4 m/s

(c)   9 m/s                                 (d)  4 m/s

Answer-d

(3)

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