ASTR 101 Lecture Notes - Lecture 16: Radio Astronomy, Electric Field, Low Frequency
6 Sep 2016
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It"s propagation is the transport of energy from one place (or one body) to another. An energetic (i. e. hot) body can simply lose energy (light) to its surroundings: e. g. An energetic (i. e. hot) body can simply lose energy (light) to its surroundings: e. g. a star shining into the void. But if the light is received and absorbed, there is an exchange of energy with warming effects (possibly even life-sustaining, as here on earth) The light can be interpreted: there is information to be gleaned from its analysis. Three ways light can reach us: by direct emission: all bodies emit light, with very hot ( incandescent") objects emitting visible light. We use this daily, as we look at everyday objects under natural of artificial illumination. Its propagation through space: light provides our most important and essential window on the. It travels through the nearly perfect vacuum of space, at the highest possible speed (symbolized by c )
