• Two cylindrical capacitors have radii a = 1 cr and b = 2.5 cm. If the space between the %3D %3D is filled with an inhomogeneou: dielectric with ɛ, = (10 +p)/ p, where p is ir cm, find the capacitance per meter of the capacitor. %3D

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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).