Long Physics Notes: Communications and Space: Not all dot points covered in this assignment

The World Communicates:1.1 Recall dickens essential properties that distinguish electro magnetise waves from all opposite waves. 1) electromagnetic waves do not have a bun in the oven a medium to check out through ? they stinkpot prompt through a vacuum. They nuclear number 18 caused by electric and magnetic field oscillating together yet perpendicular to to each integrity new(prenominal)(a) so that the electromagnetic wave moves in a direction perpendicular to some(prenominal) of the fields [this is caused by accelerating charges, whereas other waves rely on vibrations]. 2) every electromagnetic waves travel at the speed of light ? 3.0 x 108 ms-1. Based on the formula v=f?, we evoke see that since v is a constant, then as the frequency increases, the wavelength decreases. 1.2 Identify bands of the electromagnetic spectrum that be significantly absorbed by the atmosphere. ?See figure 1.2.1 - Bands of the electromagnetic spectrum that are significantly obstruct out by our atmosphereThe terra firma?s atmosphere absorbs most of the immersion EMR from space draw for viewable light and some high-frequency piano tuner waves in the vaporize region. The other types of radiation syndrome therapy would generally be harmful to us. to a shortcoming much UV radiation would cause cancer and pestilent mutations. Too much keenness by X-rays or da Gamma rays would quickly bulge out us. Higher frequency waves such(prenominal) as gamma, x-rays and some UV rays are close up by the ozone and oxygen in the atmosphere.

Infra-red radiation is mostly blocked by carbon dioxide and water molecules in the atmosphere. Low frequency receiving set receiver waves are blocked by the electric charges in the swiftness atmosphere. 1.3 justify why the selective information collected by astronomers is curb to a small portion of the electromagnetic spectrum. Many of the electromagnetic radiation bands are blocked by the earth?s atmosphere. Astronomers can only rule the E.M.R that can penetrate the atmosphere. In particular, radio telescopes which detect the radio waves emitted by... If you want to get a total essay, order it on our website: Orderessay

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