Question 2 Find the phasor voltage Ve in the circuit shown in the following Figure. Assume an ideal transformer in the circuit. The turns ratio is n=2/3. Hint: you may need to first work out the input impedance, Z1, of the terminated transformer. 30 2 j20 2 5Ω 1:n 80L-50 V V2 j8 Q: 0 V. Ideal Z1

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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).