CUET · PHYSICS · PYQ PAPER 2023

What should be the size of an obstacle to observe diffraction?

A has no relation with the wavelength
B should be exactly half of the wavelength
C should be of the same order as wavelength
D should be much larger than the wavelength

Verified Solution

Answer & Solution

Correct Answer

(C) should be of the same order as wavelength

Step-by-step Solution

Detailed explanation

Diffraction is most noticeable when the size of an obstacle or opening is comparable to the wavelength of the incident wave. If the obstacle is much larger than the wavelength, the wave effectively travels in a straight line and the bending effect is negligible. C) should be 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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