Question

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

• A. two times that of hydrogen molecule
• B. same as that of a hydrogen molecule
• C. four times that of hydrogen molecule
• D. half that hydrogen molecule

Answer 1

Answer: (B)

The average kinetic energy of an atom is given as $\frac{3}{2}kT$
It does not depend on mass of the atom.