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A beam of electrons is accelerated from rest and then passes through a pair of identical...

A beam of electrons is accelerated from rest and then passes through a pair of identical thin slits that are 1.40 nm apart. You observe that the first double-slit interference dark fringe occurs at ±18.0 ? from the original direction of the beam when viewed on a distant screen.

Through what potential difference were the electrons accelerated?

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