Two waves are said to be coherent when they
Question and options
Two waves are said to be coherent when they
- keep a constant phase difference
- originate at the same point
- diverge at single point
- have same frequency
Answer and explanation
Correct answer: A - keep a constant phase difference
Coherent waves keep a constant phase difference over time, so crest meets crest and trough meets trough in a fixed pattern. Having the same frequency alone is not enough, and waves from one point need not stay in step.
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