Question

Helium is two times heavier than hydrogen. The average kinetic energy of Helium molecule at 300 K is:

• A. $\frac{1}{2}$ of $H_2$ molecules
• B. Two times of $H_2$ molecules
• C. Four times of $H_2$ molecules
• D. Same as that of $H_2$ molecules

Answer 1

The correct option is D Same as that of $H_2$ molecules

$K.E.\propto T$ (K.E.depends only on temperature and is independent of mass.)