Question

Helium gas is filled in a closed vessel (having negligible thermal expansion coefficient). When it is heated from 300 K to 600 K, then average kinetic energy of helium atom will be :

• A. $\sqrt{2}$
• B. $2$ times
• C. unchanged
• D. half

Answer 1

The correct option is B $2$ times

Kinetic energy of gas molecules is $\frac{3}{2}RT$.

Thus $\frac{E_f}{E_i}=\frac{T_f}{T_i}=\frac{600}{300}=2$