In which of the following transition will the wavelength be minimum ?

Options

A. `n _(1) = 5, n _(2) = 4`
B. `n _(1) = 4, n _(2) = 3`
C. `n _(1) = 3, n _(2) = 2`
D. `n _(1) = 2, n _(2) = 1`

Answer

D

Explanation

In transition of electron from higher energy to lower energy level , the wavelength is given by `lambda = hc//Delta E, where Delta E` is the energy different between two levels, for minimum `lambda,Delta E` should be maximum , so (d) is the correct option.