If the rms speed of chlorine molecule is 490 m/s at 27∘C , the r.m.s speed of argon molecules at the same temperature will be (Atomic mass of argon = 39.9 u, molecular mass of chlorine = 70.9 u)
(2023 Main, 12 April I)
(a) 751.7 m/s
(c) 651.7 m/s
(b) 451.7 m/s
(d) 551.7 m/s