A beam of electrons is accelerated from rest and then, Physics

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A beam of electrons is accelerated from rest and then

A beam of electrons is accelerated from rest and then passes through a pair of identical thin slits that are 2 nm apart. You observe the first double-slit interference dark fringes occurring at ±20? from the original direction of the beam when viewed on a distant
screen.

(A) Calculate the speed of the electrons.

(B) Through what potential difference were these electrons accelerated?

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