(ii) Consider the semiconductors Ge (Eg = 0.7 eV) and GaAs (Eg = 1.4 eV) and assume that the same values of No and N, will hold as for Si (not really true !). Calculate approximate values for n; for these two semiconductors at temperatures of 80 K, 300 K and 400 K and compare to the values obtained %3D for Si at these temperatures. Also calculate the expected electrical conductivity of each of the three semiconductors at 300 K. Calculated values for ni and o: Semiconductor N; at 80 K Nj at 300K N¡ at 400 K o at 300 K Si Ge GaAs

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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).