Electromagnetic Signals in Astronomy
Most of the information we have obtained about the universe beyond the planet Earth came from electromagnetic waves, and most of the information obtained from electromagnetic waves came from steady state waves. Whenever received electromagnetic waves are decomposed into sinusoidal waves with various frequencies one thinks and acts in terms of steady state wave theory. The Doppler shift of a frequency—implied every time the term red-shift is used—is a steady state concept even though the Doppler effect is not. A frequency spectrum of received waves is a steady state concept.
KeywordsElectromagnetic Wave Large Interval Rectangular Pulse Main Lobe Sinusoidal Wave
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