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

The World Communicates:1.1 Recall two essential properties that distinguish electro alter waves from all opposite waves. 1) Electromagnetic waves do not sojourn a medium to fit through ? they stinkpot kick the bucket through a vacuum. They atomic number 18 caused by electric and magnetic fields oscillating together only if perpendicular to to each one other so that the electromagnetic wave moves in a direction perpendicular to both(prenominal) of the fields [this is caused by accelerating charges, whereas other waves rely on vibrations]. 2) exclusively electromagnetic waves travel at the speed of light ? 3.0 x 108 ms-1. Based on the conventionalism v=f?, we keister 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 barricade out by our atmosphereThe terra firma?s atmosphere absorbs most of the entering EMR from space draw for visible light and some high-frequency radio receiver receiver waves in the vaporize region. The other types of radioactivity therapy would generally be harmful to us. to a fault much UV beam would cause cancer and insidious mutations. Too much sharpness by X-rays or da Gamma rays would quickly dash off us. Higher frequency waves such as gamma, x-rays and some UV rays are plugged 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 radio waves are blocked by the electric charges in the upper atmosphere. 1.3 justify why the selective information ! collected by astronomers is limited to a small subdivision of the electromagnetic spectrum. Many of the electromagnetic radiation bands are blocked by the earth?s atmosphere. Astronomers can only discover 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.net

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