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

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Q to R

R to G

P to Q

R to S

answer is D.

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Detailed Solution

If E is the energy radiated in transition then $E_{R \to G} > E_{Q \to S} > E_{R \to S} > E_{Q \to R} > E_{P \to Q}$
For getting blue line energy radiated should be maximum $(E \propto \frac{1}{λ})$ . Hence (4) is the correct option.

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