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(A) Two sources are defined as coherent if they emit waves that maintain a constant phase difference over time.Mathematically,the phase difference $\p

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having a constant phase difference

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(A) Two sources are defined as coherent if they emit waves that maintain a constant phase difference over time.Mathematically,the phase difference $\phi$ is related to the path difference $\Delta x$ by the formula: $\phi = \frac{2 \pi}{\lambda} 	imes \Delta x$.For the interference pattern to be stable and observable,the phase difference between the waves from the two sources must not change with time.Therefore,the fundamental requirement for coherence is that the sources have a constant phase difference.

Two sources are said to be coherent if they produce waves

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