Question

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

Answer 1

Answer: (D)

R to G

Answer 2

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 (4) is the correct option.