Q8) Now consider a piece of Si doped n-type to 5 x 1015 cm3. The carrier concentration is measured over a temperature range from just above OK to about 1000K and the result is plotted as In(n) vs T(K) as in the graph below. For each of the point 1 to 5 on the graph explain the behaviour of n at this point by considering the process of carrier generation. Temp(K) LO00 Answer: 1. 2. 3. 4. 5.

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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).