Q. Coherent sources emit waves having

सुसंगत स्रोत तरंगों का उत्सर्जन करते हैं

A
Same amplitude only
केवल समान आयाम
B
Constant phase difference
लगातार चरण अंतर
C
Same intensity only
बस वही तीव्रता
D
Random phases
यादृच्छिक चरण

Explanation

Coherence means the waves maintain a constant phase relationship. This is necessary for sustained interference. Same frequency and wavelength help, but constant phase difference is the key condition.

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