Question

The diagram show the energy levels for an electron in a certain atom. Which transition shown represents the emission of a photon with the most energy?

• A. IV
• B. III
• C. II
• D. I

Answer 1

The correct option is B III

We know that $E=Rhc[\frac{1}{n_1^2}-\frac{1}{n_2^2}]$

Where $n_1$ and $n_2$ are energy levels.

Clearly,

The transition between the energy levels $n=2$ to $n=1$ will be maximum.

Thus, the transition represented by $III$ will emit the maximum energy photon.