In Young's double slit experiment,if the two | vedclass

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(A) In conventional light sources,light is emitted by a large number of independent atoms. Each atom emits light for about $10^{-9} 	ext{ s}$,meaning

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There will be no constant phase difference between the two waves

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(A) In conventional light sources,light is emitted by a large number of independent atoms. Each atom emits light for about $10^{-9} 	ext{ s}$,meaning the light emitted is essentially a pulse lasting only $10^{-9} 	ext{ s}$.Light coming from two separate sources will not maintain a fixed phase relationship because the phase of the light emitted by independent atoms changes randomly every $10^{-9} 	ext{ s}$.Since there is no constant phase difference between the two waves,the interference pattern changes too rapidly for the human eye to detect.The human eye can only perceive intensity changes that last for at least $0.1 	ext{ s}$.Consequently,instead of a stable interference pattern,we only observe a uniform intensity distribution on the screen.

In Young's double slit experiment,if the two slits are illuminated with separate sources,no interference pattern is observed because

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