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Electromagnetic Waves - Radio Waves. Radio waves are used for broadcasting radio and TV programmes. The transmitted information may be analogue or digital and uses a radio wave as a carrier. Very long wavelength radio waves can travel around the Earth despite its curvature, diffracting around the Earth's surface. These are sometimes called ground waves. Medium wavelength radio waves are reflected from an electrically charged region of the Earth's atmosphere called the ionosphere. These waves are sometimes called sky waves and can also be sent from one part of the planet to another. Shorter wavelength radio waves pass straight through the atmosphere and cannot be used to send information around the Earth's curvature. These waves are sometimes called space waves and can be used to send information in a straight line across the Earth's surface. - Microwaves. Microwaves have wavelengths shorter than radio waves. Some of these wavelengths pass easily through the atmosphere and are used...

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