Which of the following transitions gives photon of maximum energy?

Options

A. `n=2` to `n=6`
B. `n=6` to `n=2`
C. `n=2` to `n=1`
D. `n=1` to `n=2`

Answer

C

Explanation

For highest frequency in emission spectra the difference of energy between two states involved should be maximum ltrgt `DeltaeV_(2-4)=10.2 eV, DeltaE_(oo)=13.6 eV`
`Delta_(oo-1)=3.4 eV, DeltaE_(6-2) lt DeltaE_(oo-2), DeltaE_(6-2) lt DeltaE_(2-1)`
So photons of highest frequency wil be number for `n=2` to `n=1`