You have semiconductor is equal to or above the bandgap energy, absorbed. For the various radiation types in the table below, state if the radiation will be absorbed or passed through each semiconductor. Incident Frequency Semiconductor Absorb Yes No 5x1017 Hz GaAs 2x1014 Hz Ge 1013 Hz Ge

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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).