alleryTwo sources whose phase difference does not change are:
AConvergent
BCoherent
CIncoherent
DDivergent
Answer & Solution
Correct answer: B. Coherent
1. The two sources are watched at one point over time.
2. If their phase difference holds steady, they are coherent.
3. Two needles moving up and down together behave this way.
_Source: syllabus Physics Part II, Chapter 10, Wave Optics._
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