BOOKWORK An electron beam passes through a region between two plates with a poten- tial difference giving rise to an electric field of E = 10ʻ Vm-1. External coils give a magnetic field of B = 10-4 T in this region, at right angles to the electric field and to the electron beam. The electron beam is undeflected (follows a straight line) in this region. Calculate the velocity of the electrons.

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A: The solution is given below

Photoelectric

The photoelectric effect occurs when light (or similar incident radiation, including X-rays) falls on material together with a metal plate and causes it to emit electrons. The discovery of the photoelectric effect led to important new theories (and to a Nobel Prize for Albert Einstein). Photoelectric cells, or photocells, are utilized in burglar-alarm light detectors and garage-door openers (each employs a through-beam of light this is broken when something movements throughout it), and also to play soundtracks on film movies (in which a light beam shines through the soundtrack encoded at the film and is "read" with the aid of the photocells).