What is the resistance of the Aluminum bus bar on the outdoor substation which has a diameter of 4 inches and 15 ft long if the resistivity of each bar is 2.82x10-8 Ohm-m? a. 1.6555 x 10^-5 Ohm         b. 1.5907 x 10^-5 Ohm         c. 1.6555 x 10^-6 Ohm         d. 1.5907 x 10^-6 Ohm

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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).