How does a CD work? Detailed answer

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How does a CD work? Detailed answer

Big encyclopedia for children and adults

Directory / Big encyclopedia. Questions for quiz and self-education

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How does a CD work?

In contrast to gramophone records, on which the sound is recorded with an oscillating needle in the form of a thin groove, for recording on a CD, the sound is first digitized, and then, in the form of a microscopic size of "dots", is burned on the surface of a thin aluminum foil by a laser beam. During playback, the laser beam illuminates the disc, "reads" the set of recorded "dots", and then the signal is again converted into sound form.

There are also CD-ROMs and DVD-ROMs for storing more information on them.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

What kind of seeds did Darius and Alexander send to each other before the battle, and what did it mean?

In 333 BC, before the Battle of Issus, the Persian king Darius III sent his opponent Alexander the Great as a challenge to battle a bag of sesame seeds, which symbolized the number of soldiers in his army (sesame seeds are very small, a thousand seeds weigh only 2-5 grams ).

Alexander immediately answered this with a bag of mustard seeds, implying that although his army was smaller in number, they were hotter in battle.

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Random news from the Archive

Formic acid bus 09.07.2017

Dutch student inventors have created the world's first bus that runs on formic acid, a cheap and environmentally friendly fuel.

Formic acid was first isolated from red wood ants (hence its name) in the XNUMXth century. Also in nature, it is found in some plants, for example, nettles and needles, and in the caustic secretions of bees. Usually it is obtained chemically in the production of acetic acid as a by-product. Formic acid is already used in many areas: the chemical industry (as a solvent), food (as a preservative), beekeeping (for pest control) and medicine (as an external pain reliever).

The fuel used by the new bus was named hydrozine (not to be confused with hydrazine) by the student inventors. It is a liquid that can be easily and relatively safely transported. Stations with formic acid will look and be used as the most common gas stations. The only difference is that the fuel in them is much cleaner. The bus will not emit any harmful gases - only water and CO2.

The fuel is created inside a device that Dutch students are now trying to patent. There, Hydrozine is decomposed into hydrogen and carbon dioxide with the help of a catalyst. The hydrogen is then added to a fuel cell, which it will react with to generate electricity that powers the engine.

The bus has an electric drive system developed by VDL. The tank is designed for 300 liters, so the researchers say the bus will be able to travel up to 200 kilometers. The vehicle is expected to be in active use by the end of this year.

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