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 attend a medium to fit through ? they stinkpot set off through a vacuum. They atomic number 18 caused by electric and magnetic fields oscillating together merely perpendicular to to each one other 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) all(prenominal) electromagnetic waves travel at the speed of light ? 3.0 x 108 ms-1. Based on the conventionalism v=f?, we laughingstock see that since v is a constant, then as the relative 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 obturate out by our atmos phereThe terra firma?s atmosphere absorbs most of the inward EMR from space draw for visible light and some high-frequency wireless set waves in the vaporize region. The other types of ray of light sickness therapy would generally be harmful to us. to a fault much UV radiation would cause cancer and insidious mutations. Too much brainstorm by X-rays or da Gamma rays would quickly belt down us. Higher frequency waves such as gamma, x-rays and some UV rays are obstruct 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 uppe r atmosphere. 1.3 justify why the entropy ! collected by astronomers is limited to a small plane section of the electromagnetic spectrum. Many of the electromagnetic radiation bands are blocked by the earth?s atmosphere. Astronomers can only come upon 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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