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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

DxD = 5 – 4 = 1 = λ4\frac{\lambda}{4}

Df = 2πλ\frac { 2 \pi } { \lambda } λ4\frac{\lambda}{4} = p/2 \ I0 = I0 + I0 + 0 = 2I0