CUET · PHYSICS · PYQ PAPER 2023

The radius of innermost electron orbit of a hydrogen atom is \( 5.3 \times 10^{-11} \text{ m} \). What is the radius of n = 2 orbit ?

A \( 2.12 \times 10^{-11} \text{ m} \)
B \( 4.77 \times 10^{-10} \text{ m} \)
C \( 4.77 \times 10^{-11} \text{ m} \)
D \( 2.12 \times 10^{-10} \text{ m} \)

Verified Solution

Answer & Solution

Correct Answer

(D) \( 2.12 \times 10^{-10} \text{ m} \)

Step-by-step Solution

Detailed explanation

\( r_n = r_1 n^2 \) \( r_2 = (5.3 \times 10^{-11} \text{ m}) (2^2) \) \( r_2 = 5.3 \times 10^{-11} \times 4 \text{ m} \) \( r_2 = 2.12 \times 10^{-10} \text{ m} \)

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.

Same subject

Explore more questions on app

From CUET

Match List-I with List-II

List-I (Uses of electromagnetic waves)	List-II (Type of electromagnetic waves)
(A) Aircraft navigation	(I) Infrared waves
(B) Cellular phones	(II) Microwaves
(C) Remote switches for TV sets	(III) Ultraviolet rays
(D) LASIK eye surgery	(IV) Radio waves

Choose the correct answer from the options given below:

CUET 2025 Easy

Explore more questions on app