Q. A liquid is in equilibrium with its vapour at it’s boiling point. On the average, the molecules in two phases have equal
A) Inter-molecular forces
B) Potential energy
C) Kinetic energy
D) Total energy
Explanation
(c)
In $liquid\ \rightleftharpoons vapour$, equilibrium the rate at which molecules escape from the liquid surface to gaseous phase equals to rate at which molecules in the gas phase strike the surface and becomes the part of liquid. Hence, the molecules in the two phases have equal kinetic energy.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.