In a double slit experiment, interference is obtained from electron waves produced in an electro...

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In a double slit experiment, interference is obtained from electron waves produced in an electron gun supplied with voltage \( V \). If \( \lambda \) is wavelength of the beam, \( D \) is the distance of screen, \( d \) is the spacing between coherent sources, \( h \) is Planck's constant, \( e \) is charge on electron and \( m \) is mass of electron, then fringe. width is given as
(A) \( \frac{h D}{\sqrt{2 m e V d}} \)
(B) \( \frac{2 h D}{\sqrt{m e V D}} \)
(C) \( \frac{h d}{\sqrt{2 m e V D}} \)
(D) \( \frac{2 h d}{\sqrt{m e V D}} \)
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