Electromagnetic waves are invisible creates of energy that take trip though the universe. However, you have the right to "see" several of the outcomes of this energy. The light that our eyes can see is actually part of the electromagnetic spectrum.

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This visible component of the electromagnetic spectrum is composed of the colors the we check out in a rainbow - native reds and oranges, through blues and purples. Each of this colors actually synchronizes to a various wavelength that light.


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Electromagnetic waves

The sound we hear is a result of tide which we cannot see. Sound waves need something to travel through in order because that it to move from one ar to the next. Sound deserve to travel with air due to the fact that air is made of molecules.

These molecules lug the sound tide by bumping into each other, choose dominoes knocking each other over. Sound deserve to travel with anything do of molecules - also water! over there is no sound in an are because there room no molecules over there to transmit the sound waves.


Electromagnetic spectrum

Electromagnetic waves are not like sound waves since they do not require molecules come travel. This method that electromagnetic waves have the right to travel v air, solid objects and even space. This is just how astronauts ~ above spacewalks usage radios to communicate. Radio waves room a kind of electromagnetic wave.


Electromagnetic spectrum

Electricity can be static, prefer what stop a balloon to the wall surface or provides your hair was standing on end. Magnetism can likewise be static prefer a frozen fridge magnet. However when they readjust or relocate together, they do waves - electromagnetic waves.

Electromagnetic tide are created when an electric field (which is shown in red arrows) couples with a magnetic field (which is displayed in blue arrows). Magnetic and electric areas of one electromagnetic wave space perpendicular to each other and to the direction that the wave.

When you hear to the radio, watch TV, or cook dinner in a microwave oven, you room using electromagnetic waves. Radio waves, tv waves, and also microwaves space all types of electromagnetic waves. They just differ native each other in wavelength. Wavelength is the distance between one wave crest come the next.

Waves in the electromagnetic spectrum vary in size from very long radio tide the size of buildings, to an extremely short gamma-rays smaller sized than the size of the nucleus of an atom. Yet their size have the right to be regarded their energy.

The smaller the wavelength the higher the energy. Because that example, a brick wall blocks clearly shows light wave lengths. Smaller, much more energetic, x-rays deserve to pass v brick walls, however themselves room blocked by denser product such as lead.

While it have the right to be said waves are "blocked" by particular materials, the correct knowledge is that wave lengths of energy are "absorbed" by objects, or not. That is, wave length energy can be took in by certain material.

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We use this knowledge in starrkingschool.net satellites as the atmosphere additionally absorbs some wave lengths while permitting others to happen through.