AST201H1 Lecture Notes - Lecture 4: Roygbiv, Electromagnetic Radiation, Space Telescope
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Electromagnetism, 1/137, infinite, make atoms cling to each other. It is not what the source or velocity of the observer, reference frame of the observer, velocity of the source of the light. No type of matter that can be transmitted faster than the speed of light. Wavelength is the distance between adjacent peaks of the electric (and magnetic) field. While frequency is the number of times each second that the electric (and magnetic) field vibrates up and down (or side to side) at any point. Electromagnetic radiation is more than just visible light. (infrared) roygibiv (ultraviolet) X-rays, infrared, microwave, radio (insert slide for the electromagnetic spectrum) (insert slide of major space observatories) Atmosphere actually absorbs and reacts to other types of radiation, lose energy before reaching the ground. For visible, telescopes on the ground and high altitude and stable atmosphere. Before about 1950, all astronomy was done using visible light. Since 1950, astronomy has used all forms of radiation.