Q. Two sources of waves are called coherent if
A) Both have the same amplitude of vibrations
B) Both produce waves of the same wavelength
C) Both produce waves of the same wavelength having constant phase difference
D) Both produce waves having the same velocity
Explanation
(c) Two coherent source must have a constant phase difference otherwise they can not produce interference
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.