PHYSICS · Single correct · A Level · Physics · Further mechanics and thermal physics · Further mechanics and thermal physics
Problem
When a liquid boils, it changes its state from liquid to gas.Which one of the following combinations correctly describes the changes to the average kinetic energy and the potential energy of the molecules during the boiling process?
(1) average kinetic energy stays the same; potential energy stays the same
(2) average kinetic energy stays the same; potential energy increases
(3) average kinetic energy increases; potential energy stays the same
(4) average kinetic energy increases; potential energy increases