In a vacuum tube, electrons are boiled out of a hot cathode

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In a vacuum tube, electrons are boiled out of a hot cathode

In a vacuum tube, electrons are boiled out of a hot cathode at a slow, steady rate and accelerated from rest through a potential difference of 39.0 V. Then they travel altogether 28.5 cm as they go through an array of slits and fall on a screen to produce an interference pattern. Only one electron at a time will be in flight in the tube, provided the beam current is below what value? In this situation the interference pattern still appears, showing that each individual electron can interfere with itself.

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