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Electromagnetic waves - Harvard University

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).

1Technically, all waves carry momentum, but this momentum is suppressed by a factor of v=c, where v is the speed of the wave and c is the speed of light. This follows from the relativity fact that energy is equivalent to mass. So a °ow of energy implies a °ow of mass, which in turn implies nonzero momentum. However,

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