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JEE Main 2013 (23 Apr, Shift 1) · Superposition, Coherence & Intensity

Superposition, Coherence & Intensity question from JEE Main 2013 (23 Apr, Shift 1)

Q98JEE Main 2013 · 23 APR · SHIFT 1Medium

Superposition, Coherence & Intensity

$n$ identical waves each of intensity $I_0$ interfere with each other. The ratio of maximum intensities if the interference is (i) coherent and (ii) incoherent is:

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Answer: (d)

Coherent: amplitudes add, $A = na$ , so $I_{max} = n^2 I_0$ .
Incoherent: intensities add, $I = nI_0$ .
Ratio $= \frac{n^2 I_0}{n I_0} = n$
So the answer is (d) $n$ .

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