What are the conditions for destructive interference to occur?
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Solution
Interference
It is a phenomenon in which two waves superpose with each other to form a resultant wave that has lower, higher or the same amplitude.
There are two types of wave interference, constructive interference, and destructive interference.
Destructive interference:
Destructive interference is the case in which two waves superimpose giving rise to a wave of very less or negligible intensity.
Condition for destructive interference
It occurs when the maxima of two waves are out of phase, i.e., a positive displacement in one wave is canceled out by negative displacement in the other wave.
Or path difference should be, where is the wavelength.
In the figure, we can see that the two waves are in phase difference. Here, the amplitude of the resultant wave(here shown in red) is equal to zero.