3- Determine the current flowing through an element if the charge flow is given by (a) dt)= (31+8) mC (b) di) = (82 +4t-2) C (c) q(1) = (3e* – se-2" )nc (d) di)=10sin 120n t pC (e) dt) = 20e" cos 50t µC %3D %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).