CUET · PHYSICS · PYQ PAPER 2023
Let us consider interference between two sources of intensities \( I \) and \( 4I \). What will be the intensity at points where the phase difference is \( \pi \) ?
- A \( I \)
- B \( 5I \)
- C \( 9I \)
- D \(0 \)
Answer & Solution
Correct Answer
(A) \( I \)
Step-by-step Solution
Detailed explanation
\( I_{res} = I_1 + I_2 + 2\sqrt{I_1 I_2} \cos(\phi) \) \( I_{res} = I + 4I + 2\sqrt{I \cdot 4I} \cos(\pi) \) \( I_{res} = 5I + 2(2I)(-1) \) \( I_{res} = 5I - 4I \) \( I_{res} = I \)
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