JEE Main & Advanced
JEE Main Paper (Held On 15 April 2018) Slot-II
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)] \[\left[ {{k}_{B}}=1.4\times {{10}^{-23}}J/K;{{m}_{He}}=7\times {{10}^{-27}}kg \right]\]