Question

what
are the coherent sources give example
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Answer 1

two wave sources are perfectly coherent if their frequency and waveform are identical and their phase difference is constant. Coherence is an ideal property of waves that enables stationary interference.

Answer 2

Coherent Source Example

Laser light is an example of coherent source of light. The light emitted by the laser light has the same frequency and phase. Sound waves are another example of coherent sources. The electrical signals from the sound waves travel with the same frequency and phase.