Two monochromatic light waves of amplitudes 3A and 2A interfering at a point have a phase difference of 60^ . The intensity at that point will be proportional to

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Accepted Answer

Correct answer: D. (d): Here, _1=3 , _2=2 , =60^ The resultant amplitude at a point is R = _1^2+ _2^2+2A_1 _2 cos ⁡ = (3A )^2+ (2A )^2+2 3A 2A cos ⁡60^ = 9A^2+4A^2+6A^2=A 19 As Intensity ∝ (Amplitude) ^2 Therefore, intensity at the same point is I ∝19A^2

$Two monochromatic light waves of amplitudes 3 A and 2 A interfering at a point have a phase difference of 60^{\circ} . The intensity at that point will be proportional to$

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