How fast is light moving? Detailed answer

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How fast is light moving? Detailed answer

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How fast is light moving?

How to say.

We often hear that the speed of light is constant, but this is not true. Light reaches its maximum speed of almost 300 km/s only in a complete vacuum.

In any other medium, the speed of light is very different from the maximum and is always below the figure that each of us knows by heart. Through diamonds, for example, light travels more than twice as slowly, at about 130 km/s.

Until recently, the most trifling officially recorded speed of light (through sodium at a temperature of minus 272 ° C) was a little more than 60 km / h - a racing bike is faster.

In 2000, the same group of scientists (from Harvard University) managed to bring light to a complete stop by pointing it at the "back" (Bose-Einstein condensate) of the chemical element rubidium.

Rubidium was discovered by the German chemist Robert Bunsen (1811 - 1899), who did not invent the Bunsen burner named after him.

Amazingly, the light is invisible.

The light itself cannot be seen, you can only see what it hits. A light beam in a vacuum incident perpendicular to the observer is absolutely invisible.

All this, of course, is very strange, but it is quite logical. If light were visible, it would form a kind of fog between our eyes and everything in front of us.

Darkness is no less a strange thing. It's not there, but you can't see anything through it.

Author: John Lloyd, John Mitchinson

Random interesting fact from the Great Encyclopedia:

Why did the poets not like Mayakovsky for writing poems with a ladder?

When Mayakovsky introduced his famous verse "ladder", fellow poets accused him of cheating - after all, poets were then paid for the number of lines, and Mayakovsky received 2-3 times more for poems of a similar length.

Test your knowledge! Did you know...

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Leaky water pipes in the world's cities waste 88 billion liters of purified water every day, according to the World Bank. Experts consider it acceptable to lose 3500 liters of water per day per kilometer of main pipes. To cope with even such "small" losses, it is necessary either to change the entire system, or to reduce the water pressure in the water supply.

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Water pressure drives this system through the pipe. When it crawls up to the crack, the pressure of water squeezes out a little repair mixture into the crack, which soon hardens. After that, it is necessary to wash the pipes and again let the water into the residential areas.

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