NATS 1945 Lecture Notes - Lecture 10: Microwave Oven, Positron Emission Tomography, Ozone Depletion
29 Nov 2016
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Gamma rays, x rays, uv, ir, microwaves, tv/fm, am. Compare each wavelength to an object of similar size - eg, elephants, cells, atoms, etc. Am is 300m, fm/tv is 3m, microwaves are 10cm, ir is. 0. 002cm=20um, uv is 0. 3um, xrays and gamma rays are. 10 to the power of 9 & 11 meters. Objects produce thermal radiation by the vibration of electrons. At room temp, the radiation peaks in ir. In high temp, the radiation spectrum can include visible, causing matter to glow. Stinger missiles can be launched from a device, held by a single solider, and aimed at a low-flying plane. They have a device that steers them towards anything that is emitting strong ir. Infrared viewers are needed to see humans in the dark. Long wl ir viewers pick up infrared radiation emitted by warm people. Short wl ir viewers emit a flashlight that cant be seen by humans but can be seen through infrared viewers.
