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Question: In the figure the intensity of waves arriving at D from two coherent sources S<sub>1</sub> and S<sub...

In the figure the intensity of waves arriving at D from two coherent sources S1 and S2 is I0. The wavelength of the wave is l = 4 m. Resultant intensity at D will be –

A

4I0

B

I0

C

2I0

D

Zero

Answer

2I0

Explanation

Solution

Dx = S2D – S1D = 5 – 4 = 1 = λ4\frac{\lambda}{4}

\ Df = 2πλ\frac{2\pi}{\lambda} . λ4\frac{\lambda}{4}= π2\frac{\pi}{2}, IR = 2I0