Question

The potential energy of the orbital electron in the ground state of hydrogen atom is –E. What is the kinetic energy ?

• A. 4E
• B. 2E
• C. E/2
• D. E/4

Answer 1

Answer: (C)

E/2

Answer 2

KE = –$\frac{U}{2}$ = –$\frac{1}{2}$ (–E) = E/2