What are radio waves? Detailed answer

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What are radio waves? Detailed answer

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What are radio waves?

Did you know that the space around us is constantly penetrated by radio waves coming from the nearest TV and radio broadcasting stations? Because of these waves, all metal objects in the room vibrate slightly all the time. You can't hear this vibration until it causes sound waves, and that's exactly what happens when you turn on your radio. Radio waves can be called disturbing the rest of the medium propagating in space. When they occur, the electrons begin to move quickly back and forth.

Heat and light propagate in space also in the form of waves. The difference is that radio waves have a much longer length than heat and light waves. Radio waves propagate in space in the same way that waves from a pebble thrown into water diverge - in circles in all directions from their source. Although all radio waves travel at the same speed, about 300 kilometers per hour, the number of waves passing through one point in space in one second can be different. This number is called the wave frequency.

One completed wavelength is called a period. Thus, frequency is the number of complete periods that a wave travels in one second. If the wavelength is short, the waves travel closer to each other, their peaks are also closer to each other, and they quickly replace each other. If the wavelength is long, the tops of the waves are far apart, and they replace each other slowly. It turns out that long waves have a low frequency, since their crests do not replace each other with the same frequency as in short waves.

High frequency waves are measured in kilohertz, or thousands of hertz. On your radio, from left to right, the numbers are 540, 550, 560, and so on up to 1600 kHz. Each number refers to the frequency of the waves. A certain radio station broadcasts on a wave of only its certain frequency.

The existence of radio waves was predicted even before they were actually discovered. This prediction was made in 1864 by James Maxwell. And in 1888, the German physicist Heinrich Hertz proved that such waves do exist and explained how they propagate in space.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

What do fish eat?

If you've ever been on a fishing trip, you must be convinced of anything but what you offer them as bait. City boys often fish with bread on a hook. Village boys use worms for this. Trout fishermen take flies for this purpose. And some fish are tempted by the sight of another fish on the hook. Since there are thousands of species of fish, it is impossible to describe everything they eat. But the struggle for existence under water is so intense that the fish are accustomed to not being too picky about food.

Some fish are vegetarians and do not eat any living creatures, but most of them are predators, that is, they eat other fish or marine animals and insects. It is curious that many fish are happy to eat small crustaceans or shell animals. Although fish are very different, they still have a few things in common. For example, most often fish have an elongated, pointed shape that allows them to move quickly in the water.

Most fish use their tail as propulsion and control their movement with both their tail and fins. They breathe with gills, through which water constantly passes from the mouth.

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