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Electromagnetic spectrum
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Electromagnetic spectrum full explain notes pdf for students
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ElectromagneticSpectrum
,• Scientists have found that many types of wave can be arranged together
like the notes on a piano keyboard, to form a scale.
• The 'low notes' have a low frequency and a long wavelength.
• The 'high notes' have a high frequency and a short wavelength.
• When we say "wave", you might think of a wave on the sea. There, it's nice
and obvious what's going on - the surface of the sea is vibrating up and
down.
• With a sound wave, it's the air particles that are vibrating.
• So what's vibrating when an electromagnetic wave passes by?
That's not so easy.
Electromagnetic waves are vibrations of magnetic and electric fields.
• So they don't need air in order to travel. They don't need anything to be
there at all.
, How do the waves fit into the
electromagnetic spectrum?
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