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Lecture 14 Notes - Recap of last lecture Electromagnetic...

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Recap of last lecture Electromagnetic waves do not need a medium to propagate Time varying E and B fields produce EM waves such as E & B fields associated with accelerating charged particles. They satisfy the wave equation and v = f λ, in vacuum v = c = 3x10 8 m/s EM waves span a huge range of wavelengths (10s of m to 100ths of a nm) and frequency (few Hz to 10 22 Hz) Visible light is a small fraction of this spectrum (400 – 700 nm) And EM radiation is ubiquitous in many different forms. http://orbitingfrog.com/blog/2008/06/25/earth-and-friends-in-multiple-wavelengths/ Electromagnetic waves are transverse (E∙B =0) and the direction of propagation given by ExB (right had rule applies). They propagating at unchanging speed c = 1/ sqrt( ε 0 µ 0 ) in vacuum. The electric and magnetic fields in a E&M wave have a definite ratio (E=cB), and requiring no medium (like water or air) to propagate.
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The moon at multiple wavelengths Radio Microwave Infrared visible Ultraviolet X-ray Crater Tycho
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Wave Equation
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Electromagnetic waves are sinusoidal y y x z x y
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