Essay on The Electromagnetic Spectrum

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The Electromagnetic Spectrum The electromagnetic spectrum is the collective name for all types of radiation. Radiation is energy that travels around in waves. The electromagnetic spectrum goes from the waves with the lowest energy to those with the highest energy. Radio Waves [IMAGE] Radio waves have the longest wavelengths in the electromagnetic spectrum. They can be from as long as a football to as long as a football pitches. Radio waves carry

middle of document…

[IMAGE]Celestial bodies that transmit radio waves: Karl Jansky was the

first to determine that radio emission from the heavens could be

detected. At the Bell Laboratory in 1932, Jansky built a rotating

antenna, and attempted to investigate the source of the short wave

interference. He found that there was a hiss-type static that was the

most intense when the antenna was directed downward towards the centre

of the galaxy. He found that the galaxy itself was an intense source

of radio radiation. Some celestial bodies that emit radio waves that

sound like static, are Venus and Jupiter. These sounds are caused by

terrestrial thunderstorms.



Radio telescopes look toward the heavens at planets and comets, giant

clouds of gas and dust, and stars and galaxies. By studying the radio

waves originating from these sources, astronomers can learn about

their composition, structure, and motion. Radio astronomy has the

advantage that sunlight, clouds, and rain don't affect observations.





[IMAGE]Microwaves



Microwaves are measured in centimetres because they are so big. They

range in size but it is the larger ones that we use to heat or food in

a microwave oven.



Microwaves are good for transmitting information from one place to

another because microwave energy can penetrate haze, light rain and

snow, clouds, and smoke.



[IMAGE]Shorter microwaves are used in remote
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