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Resultant Amplitude

nbsp;Two mono...

Question

Two monochromatic interfering waves of equal amplitude 'a' superpose on a screen. If the phase difference between the waves pi/2, what is the resultant intensity?

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Solution

The resultant intensity would indeed be zero, have a look at the re,ation below
the resuatnt intensity is written as'
I = 2I'(1 + cosÎ´) = 4I'cos²(d/2)

so, if d = Ï€/2; cosÎ´ = 0
thus, the resultant intensity would be , I = 0

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