What are some of the reasons that some (perhaps all) of your readings do not match the calculated values? Electrochemical Cell 1. Observed Voltage: +0.859 V, Calculated Eo for cell: 1.1 V Electrochemical Cell 2. Observed Voltage: -0.379 V, Calculated Eo for cell: -0.47 Electrochemical Cell 3. Observed Voltage: +0.031 V, Calculated Eo for cell: -0.31 V Electrochemical Cell 4. Observed Voltage: +0.200 V, Calculated Eo for the cell: +0.19 V

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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).