CUET · PHYSICS · PYQ PAPER 2023

If the total energy is transferred by the electromagnetic waves on a surface be \(U\) in time \(t\), then the total momentum delivered to the surface is

A Uc
B \(\frac{c}{U}\)
C \(\frac{U}{c}\)
D \(\frac{U^2}{c}\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(\frac{U}{c}\)

Step-by-step Solution

Detailed explanation

Electromagnetic waves carry momentum \(p\) related to their energy \(U\) by the equation \(p = U / c\). When a surface absorbs this energy, it receives a total momentum equal to the energy divided by the speed of light. C) \(\frac{U}{c}\)

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	LIST II
A. \(\left[1+\left(\frac{d y}{d x}\right)^2\right]=\left(\frac{d^2 y}{d x^2}\right)^2\)	I. order \(=2\), degree \(=2\)
B. \(\frac{d^3 y}{d x^3}-3 \frac{d^2 y}{d x^2}+2\left(\frac{d y}{d x}\right)^4=y^4\)	II. order \(=3\), degree \(=2\)
C. \(\left(1+\frac{d y}{d x}\right)^3=\left(\frac{d^3 y}{d x^3}\right)^2\)	III. order \(=2\), degree \(=1\)
D. \(\left[1+\left(\frac{d y}{d x}\right)^2\right]^?=\frac{d^2 y}{d x^2}\)	IV. order \(=3\), degree \(=1\)

Choose the correct answer from the option given below:

CUET 2023 Medium

Explore more questions on app

List-I	List-II
A. Elementary reactions	I. No energy of activation
B. Complex reactions	II. Single step
C. Free radical combination	III. High energy of activation
D. Slow reactions	IV. Several elementary steps