CUET · PHYSICS · PYQ PAPER 2023

In Young's Double Slit experiment, the intensities of two coherent monochromatic waves are I and 4I. The ratio of intensity at maxima to minima will be :

A \(16: 1\)
B \(25: 9\)
C \(9: 3\)
D \(9: 1\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(25: 9\)

Step-by-step Solution

Detailed explanation

\(I_{max} = (\sqrt{I_1} + \sqrt{I_2})^2 = (\sqrt{I} + \sqrt{4I})^2 = (3\sqrt{I})^2 = 9I\) \(I_{min} = (\sqrt{I_1} - \sqrt{I_2})^2 = (\sqrt{I} - \sqrt{4I})^2 = (-\sqrt{I})^2 = I\) \(\frac{I_{max}}{I_{min}} = \frac{9I}{I} = \frac{9}{1}\)

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

Explore more questions on app

LIST I	LIST II
A. Multimolecular colloids	I. Nitro cellulose
B. Macromolecular colloids	II. Sulphur molecule
C. Associated colloids	III. Nylon
D. Colloidion	IV. Soaps