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MHT CET 2025 (26 Apr, Shift 1) · Transitions, Photon Emission & Excitation

Transitions, Photon Emission & Excitation question from MHT CET 2025 (26 Apr, Shift 1)

Q13MHT CET 2025 · 26 APR · SHIFT 1Medium

Transitions, Photon Emission & Excitation

The ratio of energies of photons produced due to transition of electron of hydrogen atom from its (i) third to $2$ nd energy level and (ii) highest energy level to $3$ rd level is

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Answer: (b)

$E \propto \left(\frac{1}{n_f^2}-\frac{1}{n_i^2}\right)$
(i) $3\to2$ : $\frac14-\frac19 = \frac{5}{36}$ . (ii) $\infty\to3$ : $\frac19 = \frac{4}{36}$ .
Ratio $= 5:4$
So the answer is (b) $5:4$ .

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