CUET · PHYSICS · PYQ PAPER 2025
Which of the following statements are correct?
(A) According to wave theory, energy carried by a wave depends on the amplitude of the wave, not on the speed of wave propagation
(B) For a given frequency, intensity of light in the photon picture is determined by the number of photons crossing a unit area
(C) At a large distance from the source, a small portion of the spherical wave can be approximated by a plane wave
(D) the reflected and refracted light both have different frequencies than the incident frequency
Choose the correct answer from the options given below:
- A (A), (B) and (C) only
- B (A) and (C) only
- C (A), (C) and (D) only
- D (B), (C) and (D) only
Answer & Solution
Correct Answer
(A) (A), (B) and (C) only
Step-by-step Solution
Detailed explanation
Statement (A) is correct: In classical wave theory, the intensity (energy) is proportional to the square of the amplitude, not the propagation speed. Statement (B) is correct: In the photon model, intensity is defined as the total energy per unit area per unit time. For a fixed…
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