If the maximum electron density in the ionosphere is 4.55x109/m3, then what will be critical frequency of the ionosphere?

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A: The solution for given problem can be achieved as follows.

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Q: If the electron density of the ionosphere is 2.11x1011/m3, then what will be critical frequency?

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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).