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Question

Which of the following is not essential for two sources of light in Young's double slit experiment to produce a sustained interference?

A
Equal wavelength
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B
Equal intensity
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C
Constant phase relationship
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D
Equal frequency
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Solution

The correct option is B Equal intensity
For sustainable interference wavelength has to be same. So frequency has to be same too. Contact phase relation is also necessary to sustain the interference pattern else the pattern will keep changing so rapidly that we will not see any pattern.
Equal intensity is not a requirement to keep pattern sustained.

Answer. B) equal intensity

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