Two sources of waves are called coherent if - Vidyadip

MCQ

Two sources of waves are called coherent if

A
Both have the same amplitude of vibrations
B
Both produce waves of the same wavelength
✓
Both produce waves of the same wavelength having constant phase difference
D
Both produce waves having the same velocity

✓

Answer

Correct option: C.

Both produce waves of the same wavelength having constant phase difference

c
(c)Two coherent source must have a constant phase difference otherwise they can not produce interference.

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