An electron beam is being used in YDSE. On increasing kinetic energy of the electrons, fringe width will:

Increase

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Decrease

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Remain unchanged

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No interference pattern will be observed on the screen

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Solution

The correct option is B Decrease
Fringe width is directly proportional to wavelength of wave. If we increase the kinetic energy of the electrons, since the de – Broglie wavelength of the electron beam will reduce, the fringe width will also decrease.

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