According to Bohr's theory, the energy required for transition of
H-atom from
n=6 to
n=8 is given as
Δε6→8=13.6eV[−]=13.6eV[−] =13.6eV×0.012=0.1652eV ........(i)
(a) Energy for transition of H-atom electron from
n=5 to
n=7.
Δε5→7=13.6eV[−] =13.6eV×0.196 Δε5→7=0.266 Energy for transition from
n=5 to
n=7 is not equal to transition from
n=6 to
n=8.
(b) Energy for transition from
n=7 to
n=9,
Δε7→9=13.6eV[−] =13.6eV×0.0081=0.1096eV ∴ Energy for transition from
n=7 to
n=9 is not equal to transition from
n=6 to
n=8.
(c) The transition from
n=6 to
n=8 has energy less than transition from
n=5 to
n=7.
∴ Option (c) answer is correct.