CUET · PHYSICS · PYQ PAPER 2025

The ground state energy of hydrogen atom is -13.6 eV. The kinetic and potential energies of the electron in this state will be

A Kinetic energy of the electron = 13.6 eV; potential energy of the electron = -27.2 eV
B Kinetic energy of the electron = -13.6 eV; potential energy of the electron = 27.2 eV
C Kinetic energy of the electron = 13.6 eV; potential energy of the electron = -13.6 eV
D Kinetic energy of the electron = -13.6 eV; potential energy of the electron = -13.6 eV

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Answer & Solution

Correct Answer

(A) Kinetic energy of the electron = 13.6 eV; potential energy of the electron = -27.2 eV

Step-by-step Solution

Detailed explanation

\(K = -E\) \(K = -(-13.6 \text{ eV}) = 13.6 \text{ eV}\) \(U = 2E\) \(U = 2 \times (-13.6 \text{ eV}) = -27.2 \text{ eV}\)

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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(C) \(\quad \int_{-\pi / 2}^{\pi / 2} \cos x d x\)	(III) \(\pi / 4\)
(D) \(\quad \int_0^{\pi / 2} \sin ^2 x d x\)	(IV) 1

Choose the correct option from the ones given below :

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