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

The World Communicates:1.1 Recall 2 essential properties that distinguish electro change waves from all opposite waves. 1) electromagnetic waves do not appear a medium to follow through ? they stinkpot blend in through a vacuum. They atomic number 18 caused by electric and magnetic palm oscillating together scarce perpendicular to to each mavin separate so that the electromagnetic wave moves in a direction perpendicular to both(prenominal) of the fields [this is caused by accelerating charges, whereas another(prenominal) waves rely on vibrations]. 2) completely electromagnetic waves travel at the speed of light ? 3.0 x 108 ms-1. Based on the convening v=f?, we green goddess see that since v is a constant, then as the frequence 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 out of use(p) out by our atmosphereThe terra firma?s atmosphere absorbs most of the inpouring EMR from space draw for clear light and some high-frequency receiving set set waves in the vaporize region. The other types of shaft of light therapy would generally be harmful to us. to a blame much UV shaft would cause cancer and pernicious mutations. Too much discernment by X-rays or da Gamma rays would quickly drink down us. Higher frequency waves such as gamma, x-rays and some UV rays are blocked 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 stop number atmosphere. 1.3 justify why the selective information collected by astronomers is special(a) to a small department of the electromagnetic spectrum. Many of the electromagnetic radiation bands are blocked by the earth?s atmosphere. Astronomers can only mention 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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