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31 - EM Waves

# 31 - EM Waves - Physics 212 Fall 2009 EM Waves Schedule...

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Physics 212 Fall 2009 EM Waves 11/09/09

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Schedule Oscillations Energy Transport Polarization Reflection Refraction Interference Two weeks of classes, then Exam 3 on Monday 11/23
Oscillations Longitudinal Oscillation (Sound) Oscillation in same direction as propagation Oscillators stay in position and move up and down They are connected to each other (transverse - via the string tension) The disturbance moves along with velocity v Transverse Oscillation (Light) Oscillation perpendicular to direction of propagation

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Traveling Wave Oscillating function repeats every 2 π y ( x ,0) = y ( x + λ ,0) y m sin( kx ) = y m sin( k ( x + λ )) k λ = 2 π k = 2 π λ k - wave number, λ - wavelength ω = 2 π f ω = 2 π T Repeat argument for y(0,t) and get
Velocity y ( x , t ) = y m sin( kx ω t ) Element at origin oscillates up and down Point of constant-y ( arrow ) moves to the right with constant speed For y(x,t) to be constant, the argument to sine function must be a constant kx ω t = const .

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31 - EM Waves - Physics 212 Fall 2009 EM Waves Schedule...

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