When a hydorgen 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 `13.6 eV`
C. its potential energy increases by `10.2 eV`
D. its angular momentum increases by `h//2pi`

Answer

D

Explanation

In ground state , kinetic energy `= 13.6 eV`, Potential energy `= -27.2 eV`
In first excited state, kinetic energy `= 3.4 eV`, Potential energy `= - 6.8 eV`
Angular momentum momentum is `= (nh)/(2pi)` , Difference of angular momentum for consecutinve orbit `= (h)/(2pi)`