R2=6.2 KN +12V R, = 1 KN I. + R= 3 10 KN v, Vin V2 %3D -12V 1. Write the node equation for the circuit shown, using only the terms Vins Vo, R1, and R2. 2. Rearrange the equation form part (1) to solve for v/Vin. 3. Replace the resistor values in the expression from part (2) and determine the gain of the op-amp cireuit shown.

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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).