question_answer

The value closest to the thermal velocity of a Helium atom at room temperature \[(300K)\] in \[m{{s}^{-1}}\] is:                                                            [JEE Online 15-04-2018 (II)] \[\left[ {{k}_{B}}=1.4\times {{10}^{-23}}J/K;{{m}_{He}}=7\times {{10}^{-27}}kg \right]\]

A)         \[1.3\times {{10}^{4}}\]                

B) \[1.3\times {{10}^{5}}\]

C) \[1.3\times {{10}^{2}}\]

D)          \[1.3\times {{10}^{3}}\]