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  4. In a Youngs double slit experiment an electron beam is used to obtain interference pattern. If the speed of electron decreases then

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Q. In a Youngs double slit experiment an electron beam is used to obtain interference pattern. If the speed of electron decreases then

Wave Optics

Solution:

Fringe width, $\beta = \frac{\lambda D}{d}$; Also, $\lambda = \frac{h}{mv} $
Here $h$ is planck's constant. This wavelength is inversely proportional to the velocity. Hence, the fringe width increases with decrease in electron speed.