CUET · PHYSICS · PYQ PAPER 2025
Identify the correct statement(s) among the following:
(A) The time taken by a light wave is \( 5 \times 10^{-9} \text{ s} \) to travel a thickness of 1 cm of glass having refractive index 1.5.
(B) Two similar waves of amplitude 3 mm and 5 mm reach a point in the same phase. The resultant amplitude will be 8 mm.
(C) Two waves of amplitude 2 mm each reach a point with a phase difference of \( \pi/2 \). The resultant amplitude is zero.
(D) If one of the slits is closed in Young's double slit experiment, the interference pattern will disappear.
Choose the correct answer from the options given below :
- A (A) and (D) only
- B (A), (B) and (D) only
- C (B) and (D) only
- D (D) only
Answer & Solution
Correct Answer
(C) (B) and (D) only
Step-by-step Solution
Detailed explanation
\( t = nd/c \) \( t = (1.5)(0.01 \text{ m}) / (3 \times 10^8 \text{ m/s}) = 5 \times 10^{-11} \text{ s} \ne 5 \times 10^{-9} \text{ s} \) (A) is incorrect. \( R = A_1 + A_2 \) \( R = 3 \text{ mm} + 5 \text{ mm} = 8 \text{ mm} \) (B) is correct.…
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