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In a double slit experiment, interferenc...

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 source, h is Planck's constant, e is charge on electron and m is mass of electron, then fringe width is given as

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If e is the charge of an electron in esu m is the mass in grams and v the voltage 'h' is the planck constant in erg sec then the wavelength of the electron in cm is