The groud state energy of hydrogen atom is `-13.6 eV`. When its electron is in first excited state, its exciation energy is

Options

A. 10.2 eV
B. zero
C. 3.4 eV
D. 6.8 eV

Answer

A

Explanation

Since `E_(0)=-13.6eV`, Energy in the excited
state
`=(-13.6)/(4)=-3.4eV`
`DeltaE`= excitation energy
=Energy needed to raise the electron from
ground state to higher level
`=-3.4+13.6=10.2eV`