To demonstrate the phenomenon of interference, we require two sources, which emit radiation of
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → the same frequency and having definite phase relationship
Interference occurs when two or more waves superpose to form a resultant wave. For stable and observable interference patterns, the following conditions must be satisfied:
1. The sources must emit waves of the same frequency.
2. The sources must have a definite phase relationship (coherent sources).
If the sources have different frequencies or random phases, the interference pattern will constantly change and will not be observable.
Answer: the same frequency and having definite phase relationship