Class 12 NEET Physics Atoms and Nuclei Part 1

Potential energy of hydrogen atom is given by PE=‌

−kZe2

r

As atom is excited, its radius increases. But due to negative sign or reverse sign. Its actual potential energy increases. And Kinetic energy is given by KE=‌

kZe2

2r

As atom is excited, its radius increases thus resulting in decrease of Kinetic energy.
Ans: The PE increases and KE decreases.