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Which pair of sources is needed to observe interference of radiation?

1. that produce waves with almost equal frequencies
2. that produce waves with identical frequencies
3. that emit waves of different wavelengths
4. that emit waves with the same frequency and maintain a fixed phase difference

Correct answer: that emit waves with the same frequency and maintain a fixed phase difference

Solution

Interference occurs when two waves interact, and for this to happen effectively, they must have the same frequency to ensure they oscillate in sync, and a fixed phase difference to maintain a consistent relationship between their peaks and troughs, leading to constructive or destructive interference.

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