The Electromagnetic Spectrum
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The electromagnetic spectrum is the entire range of radiant energies
or wave frequencies.
There are seven main regions in the electromagnetic spectrum. These
are: radio waves, microwaves, infrared, visible light, ultraviolet,
x-rays and gamma rays. Each section of the EM spectrum has a different
wavelength, these are shown in the table below
Section of EM spectrum
Wavelength (in cm)
radio waves
> 10
microwaves
10 à 10
infrared
10 à 10
Visible light
10 à10
ultraviolet
10 à 10
x-rays
10 à 10
Gamma rays
<10
Each region of the EM spectrum has different uses in everyday life.
radio waves
These are used for transmitting radio signals, phone signals and
television. Also stars and gases in space emit radio waves.
Microwaves
These are used for cooking, in our microwaves. They can also be used
for communication.
Infrared
This is used for heating, night vision and in remote controls.
Visible light
This is the light that we see. It is emitted by everything.
Ultraviolet
Is emitted from the sun, it is what tans our skin. It is also used for
sterilising, and in forensic science, to see things such as traces of
bodily fluids, which are invisible to the naked eye.
X-rays
These are used for medical purposes in hospitals, to look at our
bones.
Gamma rays
These are emitted by radioactive substances, and are also used for
killing some cancer cells.
Each regions wavelength also relates to what it is used for. For
example, radio waves are used for transmitting radio signals because
they have a long wavelength, and can therefore travel further without
being disrupted. Also the reason we can see visible light is because
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The dangers of the electromagnetic can be low on danger and high on danger. Depending on the amount of how much the body absorbs verifies the lethality of the EMFs.
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Solar is the Latin word for sun—a powerful source of energy that may be used to heat,
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