Question

Which of the following are coherent sources?
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Answer 1

Answer:

Two sources are said to be coherent when the waves emitted from them have the same frequency and constant phase difference. Interference from such waves happen all the time, the randomly phased light waves constantly produce bright and dark fringes at every point.

Answer 2

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Coherent Source Example

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

@MissTranquillity