A helium atom is two times heavier than a hydrogen molecule. At `298 K`, the average kinetic energy of a helium atom is

Options

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

Answer

B

Explanation

`(E_(He))/(E_(H2)) = sqrt((T_(He))/(T_(H_(2))))` so energies will be same for He and `H_(2)` at same temperature