When a hydrogen atom is excited from ground state to first excited state then.

Options

A. its kinetic energy increases by 10.2 eV
B. its kinetic energy decreases by 10.2 eV
C. its potential energy increases by 20.4 eV
D. its angular momentum increases by `1.05 xx 10^(-34)` J-s

Answer

B, C, D

Explanation

`|DeltaK| = 13.6 [1/1^2-1/2^2]=10.2 eV`
`|DeltaU| = 27.2 [1/1^2-1/2^2] = 20.4 eV`
`DeltaL = (2h)/(2pi) -h/(2pi) =h/(2pi)`