CUET · PHYSICS · PYQ PAPER 2023

The total energy of the electron in a hydrogen atom is \( -1.51 \text{ eV} \).
A. Its Kinetic energy is \( -1.51 \text{ eV} \)
B. Its potential energy is \( -3.02 \text{ eV} \)
C. electron is in second excited state
D. The ground state energy of hydrogen atom is 13.6 eV
Choose the correct answer from the options given below:

A C and D only
B B and D only
C A, B and C only
D B and C only

Verified Solution

Answer & Solution

Correct Answer

(D) B and C only

Step-by-step Solution

Detailed explanation

\( U = 2E = 2(-1.51 \text{ eV}) = -3.02 \text{ eV} \). (Statement B is true) \( E_n = \frac{-13.6 \text{ eV}}{n^2} \implies -1.51 = \frac{-13.6}{n^2} \implies n^2 = \frac{-13.6}{-1.51} \approx 9 \implies n = 3 \). (Second excited state, Statement C is true)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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