Q. Figure shows the energy levels $P,Q,R,S$ and $G$ of an atom where $G$ is the ground state. $A$ red line in the emission spectrum of the atom can be obtained by an energy level change from $Q$ to $S$. A blue line can be obtained by following energy level change
A) $P$ to $Q$
B) $Q$ to $R$
C) $R$ to $S$
D) $R$ to $G$
Explanation
(d) If $E$ is the energy radiated in transition then $E_{R \rightarrow G} > E_{Q \rightarrow S} > E_{R \rightarrow S} > E_{Q \rightarrow R} > E_{P \rightarrow Q}$
For getting blue line energy radiated should be maximum $\left( E \propto \frac{1}{\lambda} \right)$. Hence (d) is the correct option
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.