Electromagnetic Radiation
Req. 2.a.: Introduction to How Radio Waves Travel - ppt download
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electromagnetic radiation - How do radio waves physically "travel"? - Physics Stack Exchange
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How far do radio waves travel on earth? Can they go through the earth? - Quora
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Radio Waves and Signals Week 4. We imagine radio signals/waves travel as sine waves. The ripple of these waves are started by the vibration of an electron. - ppt download
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