Transcription of Electromagnetic waves - Harvard University
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Chapter 8 Electromagnetic wavesDavid Morin, waves we ve dealt with so far in this book have been fairly easy to visualize. Wavesinvolving springs/masses, strings, and air molecules are things we can apply our intuition we ll now switch gears and talk about Electromagnetic waves . These are harder to geta handle on, for a number of reasons. First, the things that are oscillating are electric andmagnetic fields, which are much harder to see (which is an ironic statement, considering thatwe see with light, which is an Electromagnetic wave). Second, the fields can have componentsin various directions, and there can be relative phases between these components (this willbe important when we discuss polarization). And third, unlike all the other waves we vedealt with, Electromagnetic waves don t need a medium to propagate in.
flelds in the cable (due to the capacitance and inductance), these flelds also undergo wave motion. Since the waves of these flelds travel with the same speed as the original voltage wave, it is a good bet that electromagnetic waves have something to do with light. The
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