NATS 1945 Study Guide - Quiz Guide: Microwave Transmission, Radar Imaging, Radio Astronomy
29 Mar 2019
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Compare each wavelength to an object of similar size - eg, elephants, cells, atoms, etc: gamma ray (atomic nuclei, x-ray (atom, ultraviolet (molecules, why are radio waves and microwaves ideal for broadcasting and telecommunication? transmitted easily through air. Electrons or other charged particles are accelerated. Generation of both am and fm waves follows this approach of applying an alternating voltage to an antenna. With am radio, the amplitude, or overall strength, of the signal is varied to incorporate the sound information. Better sound quality due to higher bandwidth. Microwaves have shorter wavelengths and pass through the earth"s atmosphere. Detailed images of tissue density in the body to detect disease: describe (briefly) the role of the magnet and the radio waves in this technique. A white shirt reflects most of the visible wavelengths it is exposed to, a black shirt. Use this to explain why hot metals can produce a visible glow.
