Why do we hear echoes? Detailed answer

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Why do we hear echoes? Detailed answer

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Why do we hear echoes?

At present, when we are interested in everything in nature, we want to get a correct, scientific answer. In ancient times, people created legends to explain all sorts of events. The ancient Greeks came up with a very beautiful legend to explain the echo. There she is.

Long ago, there lived a beautiful nymph named Echo. She had only one drawback - she talked too much. As punishment, the goddess Hera forbade her to speak unless spoken to. The nymph could only repeat what she was told. One day, Echo saw a handsome young Narcissus and immediately fell in love with him. However, Narcissus did not notice her. The nymph was seized with such sadness that Echo vanished into thin air, leaving only her voice. And we hear her voice, which repeats everything we say.

Of course, this sad legend will not be able to explain the nature of the echo to us. In order to get an answer, you need to remember something about sound. Sound travels in air at a speed of 335 m/s. It is carried in waves, like waves appearing in water from a pebble thrown there. Sound waves travel in all directions, just like light from a light bulb.

When it encounters an obstacle, the sound wave is reflected like light. At the same time, we hear an echo. So echo is reflected sound.

But not all obstacles create an echo. Some objects absorb rather than reflect sound. That is, the sound does not return, the echo is not heard. But usually smooth flat surfaces, such as walls, rocks, ceilings, create an echo.

Did you know that clouds reflect sound and create an echo? Indeed, when we hear thunder, this indicates that the sound of thunder is repeatedly reflected from the clouds.

Author: Likum A.

Random interesting fact from the Great Encyclopedia:

Who are hamsters?

Many children enjoy keeping hamsters and guinea pigs in their homes. These very pleasant and quick-witted rodents are easy to look after. The golden hamster reaches a length of about twelve to fifteen centimeters and weighs from one hundred to one hundred and fifty grams. Its homeland is Europe and Asia.

The English name of this animal "hamster" comes from the German word for "store". This is due to the fact that hamsters in the wild are only engaged in storing food for future use. They stuff their large cheek pouches with food, which they then store in reserve in their burrows dug in the ground.

In the cheek pouches, the hamster can carry away food weighing half his own, to shake these reserves out of his cheeks, the hamster presses them with his front paws and blows hard. He has a plump body and short legs. On the back, thick and soft fur is colored reddish-golden, and on the belly - grayish-white. The hamster is one of the fastest breeding animals.

He has four to five litters a year. The mother takes care of her cubs for about four weeks. When keeping hamsters at home, you need to remember the following: they must be able to move, otherwise they may experience something like paralysis. Therefore, the hamster cage must be equipped with a rotating exercise wheel. And if you don’t have such a wheel in your cage, you need to let the hamster out of the cage more often and allow him to run for exercise.

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