An ideal gas is confined to a cylinder with a movable piston. As it is heated to twice its initial absolute temperature, the gas is allowed to expand freely against the atmospheric pressure. The average thermal energy of the molecules (A) quadruples (B) doubles (C) increases by a factor of √2(D) remains unchanged.

An ideal gas is confined to a cylinder with a movable piston. As it is

1.	An ideal gas is confined to a cylinder with a movable piston. As it is heated to twice its initial absolute temperature, the gas is allowed to expand freely against the atmospheric pressure. The average thermal energy of the molecules (A) quadruples (B) doubles (C) increases by a factor of √2(D) remains unchanged.
Answer» Correct option is (B) doubles