Page 25 - form 5 physics chapter 1
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6.7 ANALYSING ELECTROMAGNETIC WAVES
Describe the electromagnetic spectrum
l------------Radio waves--------l
low frequency high frequency
high wavelength low wavelength
What is the • It consists of a group of waves with similar natures.
electro-
• The members of the electromagnetic spectrum
magnetic
arranged in increasing frequencies and decreasing
spectrum? wavelengths are radio waves, microwaves, infrared
rays, visible light, ultraviolet rays, X – rays and gamma
rays.
• Radio waves have the longest wavelength but are of
low frequency waves. They carry very little energy.
• Gamma rays have the shortest wavelength but are of
high frequency waves. They carry very high energy.
What is the • It is produced when electric and magnetic field vibrate
electro-
at right angle to each other.
magnetic • The direction of propagation of the wave is
wave?
perpendicular to both fields.
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