What is the Electromagnetic Spectrum?
waves can have wavelengths which
range from several thousand metres to
less than one million millionth of a metre.
The waves are divided into wavelength ranges
according to the wave's effect or uses.
This is called the electromagnetic spectrum.
You need to know the order of the regions shown above
and that radio waves have the longest wavelength
decreasing down to gamma rays which have the shortest wavelength.
How do the Wavelength, Frequency and Energy Change?
As the wavelength decreases, the frequency increases.
Radio waves have the smallest frequency
and gamma rays have the largest frequency.
The amount of energy
that the wave has
increases as the frequency increases
(and the energy of each photon increases).
Radio waves have the smallest amount of energy
and gamma rays have the largest amount of energy.
What is the Intensity of Electromagnetic Radiation?
The intensity of a
beam of electromagnetic
is a measure of the amount of energy hitting
each square metre of surface every second. The actual
amount of energy depends on the energy of each photon
as well as the number of photons hitting the surface.
The intensity of electromagnetic
radiation decreases the
travels because it spreads out over a bigger surface area
and some electromagnetic radiation is absorbed by the air.
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