• # question_answer Helium atom is two times heavier than a hydrogen molecule at 298 K, the average kinetic energy of helium is     [IIT 1982] A)                 Two times that of a hydrogen molecule B)                 Same as that of a hydrogen molecule C)                 Four times that of a hydrogen molecule D)                 Half that of a hydrogen molecule

$\frac{{{E}_{He}}}{{{E}_{{{H}_{2}}}}}=\sqrt{\frac{{{T}_{He}}}{{{T}_{{{H}_{2}}}}}}$ so energies will be same for                                 $He\And {{H}_{2}}$at same temperature.