Question:
To demonstrate the phenomenon of interference we require two soruces which emit radiation of
To demonstrate the phenomenon of interference we require two soruces which emit radiation of
Updated On: Aug 1, 2022
- nearly the same frequency
- the same frequency
- different wavelength
- the same frequency and having a definite phase relationship
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The Correct Option is D
Solution and Explanation
To demonstrate interference, to coherent sources are required. Sources are called coherent when they emit waves of nearly equal or equal frequency and a constant phase difference throughout.
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Concepts Used:
Young’s Double Slit Experiment
- Considering two waves interfering at point P, having different distances. Consider a monochromatic light source ‘S’ kept at a relevant distance from two slits namely S1 and S2. S is at equal distance from S1 and S2. SO, we can assume that S1 and S2 are two coherent sources derived from S.
- The light passes through these slits and falls on the screen that is kept at the distance D from both the slits S1 and S2. It is considered that d is the separation between both the slits. The S1 is opened, S2 is closed and the screen opposite to the S1 is closed, but the screen opposite to S2 is illuminating.
- Thus, an interference pattern takes place when both the slits S1 and S2 are open. When the slit separation ‘d ‘and the screen distance D are kept unchanged, to reach point P the light waves from slits S1 and S2 must travel at different distances. It implies that there is a path difference in the Young double-slit experiment between the two slits S1 and S2.
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