CUET · PHYSICS · PYQ PAPER 2025
The ratio of total energy of an electron in 3rd orbit to that in 5th orbit in a hydrogen atom is:
- A 9 : 25
- B 25 : 9
- C 3 : 5
- D 5 : 3
Answer & Solution
Correct Answer
(B) 25 : 9
Step-by-step Solution
Detailed explanation
\(E_n \propto \frac{1}{n^2}\) \(\frac{E_3}{E_5} = \frac{1/3^2}{1/5^2}\) \(\frac{E_3}{E_5} = \frac{5^2}{3^2} = \frac{25}{9}\)
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