Minimum excitation potential of Bohr's first orbit in hydrogen atom is

Options

A. 13.6 V
B. `-13.6 V`
C. 10.2 V
D. `-10 V`

Answer

C

Explanation

Energy of electron in ground state of hydrogen atom,
gt `" " E_(1)=-13.6eV " " [ :. E_(n)=(-13.6)/(n^(2))eV]`
`:.` Energy of electron in first excited state of hydrogen atom
`" " E_(2)=(-13.6)/(2^(2))=-3.4eV`
Hence, the excitation energy of hydrogen atom in first excited stat,
`" " E_(1)=E_(2)-E_(1)=-34-(-13.6)=10.2eV`
Therefore, excitation potential is 10.2 V.