CUET · PHYSICS · PYQ PAPER 2023
The wavelength will be minimum in the transitions of electrons from:
- A \( n = 4 \text{ to } n = 3 \)
- B \( n = 3 \text{ to } n = 2 \)
- C \( n = 2 \text{ to } n = 1 \)
- D \( n = 5 \text{ to } n = 4 \)
Answer & Solution
Correct Answer
(C) \( n = 2 \text{ to } n = 1 \)
Step-by-step Solution
Detailed explanation
For minimum wavelength, \( \Delta E \) must be maximum. \( \Delta E \propto \left( \frac{1}{n_f^2} - \frac{1}{n_i^2} \right) \) \( n = 4 \text{ to } n = 3: \left( \frac{1}{3^2} - \frac{1}{4^2} \right) = \frac{1}{9} - \frac{1}{16} = \frac{7}{144} \)…
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