A mono energetic beam of electrons me 911 x 10-31 kg, Physics

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A mono energetic beam of electrons me 911 x 10-31 kg

A mono energetic beam of electrons (me = 9.11 x 10^-31 kg) whose kinetic energy is 120 eV is incident on a single slit of width 1.0 nm. A diffraction pattern is formed on a screen 20 cm from the slit. What is the width of the central maximum (i.e. the distance among first minima) of the diffraction pattern?

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Physics: A mono energetic beam of electrons me 911 x 10-31 kg

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