Question

Coherent sources are characterized by

• A. Equal phase and phase velocity of produced wave
• B. Zero or constant phase difference along with equal frequency and amplitude of produced wave
• C. Equal amplitude of produced wave
• D. None of these

Answer 1

The correct option is B Zero or constant phase difference along with equal frequency and amplitude of produced wave

Two sources are said to be coherent, if the phase difference between them is zero or constant.
Apart from it the emitted waves will have same frequency and wavelength.