CUET · PHYSICS · PYQ PAPER 2025
The energy required to excite an electron in hydrogen atom to its first excited state is
- A 13.6 eV
- B 3.4 eV
- C 10.2 eV
- D - 13.6 eV
Answer & Solution
Correct Answer
(C) 10.2 eV
Step-by-step Solution
Detailed explanation
\( \Delta E = E_2 - E_1 = -13.6 \left( \frac{1}{n_f^2} - \frac{1}{n_i^2} \right) \) eV \( \Delta E = -13.6 \left( \frac{1}{2^2} - \frac{1}{1^2} \right) = -13.6 \left( \frac{1}{4} - 1 \right) = -13.6 \left( -\frac{3}{4} \right) = 10.2 \) eV
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