CUET · PHYSICS · PYQ PAPER 2023

Photo electric effect reveals the:

A wave nature of radiation
B particle nature of radiation
C both wave and particle aspect of radiation
D electromagnetic nature of radiation

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Answer & Solution

Correct Answer

(B) particle nature of radiation

Step-by-step Solution

Detailed explanation

The photoelectric effect demonstrates that light behaves as discrete packets of energy called photons. This phenomenon cannot be explained by classical wave theory because the emission of electrons depends on the frequency of light, not its intensity. B) particle nature of…

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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List-I (Integral)	List-II (Value)
(A) \(\int_{-1}^1(\|x\|+1) d x\)	(I) 0
(B) \(\int_{-2}^2\|x+1\| d x\)	(II) 2
(C) \(\int_{-1}^1 3\|x\|^2 d x\)	(III) 5
(D) \(\int_{-1}^1 x\|x\| d x\)	(IV) 3