PHY214 Ch 33 - Chapter 33 Electromagnetic Waves 33-2...

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PHY214- 2006 Chapter 33 Electromagnetic Waves 33-2 Maxwell’s Rainbow 33-3 The Traveling Electromagnetic Wave, Qualitatively 33-4 The Traveling Electromagnetic Wave, Quantitatively 33-5 Energy Transport and the Poynting Vector 33-6 Radiation Pressure 33-7 Polarization 33-8 Reflection and Refraction 33-9 Total Internal Reflection 33-10 Polarization by Reflection
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PHY214- 2006 33-3 The Traveling Electromagnetic Wave, Qualitatively sin( ) m E E kx t ϖ = - sin( ) m B B kx t ϖ = - 0 0 1 c μ ε = 299792458 / c m s = Electromagnetic waves : waves that consist of electric and magnetic fields. Together, the changing fields form an electromagnetic wave that travels through free space with the same speed c . Both E & B are perpendicular to the direction of travel of the wave — transverse wave. E is perpendicular to B E x B gives the wave direction E & B vary sinusoidally; vary with the same frequency and in phase with each other. E & B can be expressed as Speed of the wave is / k ϖ
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PHY214- 2006 33-3 The Traveling Electromagnetic Wave, Qualitatively m m E c B = E c B = The wave speed c and the amplitudes of E & B are related by At any point at any instance, they are related by B varies sinusoidally, it induces E (via Faraday’s law of induction) that varies sinusoidally. E then induces B (via Maxwell’s law of induction) that varies sinusoidally. Thus, E & B continuously create each other via induction, and the resulting sinusoidal variations in the fields travel as a wave, ie, the electromagnetic wave.
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PHY214- 2006
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