(a) ideal ammeter (Give your answer in mA.) 409.94 ✓ MA (b) ideal voltmeter (Give your answer in volts.) X Look for a path between the two ends of the voltmeter that does not involve any resistance so that currents do not affect the potential differences along that path. V (c) What If? How would the readings in the ammeter (in mA) and voltmeter (in volts) change if the 4.50 V battery was flipped so that its positive terminal was to the right? ideal ammeter X MA ideal voltmeter ✓ V 11.1

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A:

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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).