Lecture_27_Part_2 - Effect of E/M Radiation on Matter 1....

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1. Radiative pressure – too small to be observed in most cases 2. E/M fields can affect charged particles: nucleus and electrons Both fields (E and M) are always present – they ‘feed’ each other But usually only electric field is considered ( B=E/c ) Effect of E/M Radiation on Matter
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Effect of Radiation on a Neutral Atom Main effect: brief electric kick sideways Neutral atom: polarizes Electron is much lighter than nucleus: can model atom as outer electron connected to the rest of the atom by a spring: F=eE Resonance
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Radiation and Neutral Atom: Resonance ( ) t E E y ! sin 0 = ( ) t F eE F y y sin 0 = " = Amplitude of oscillation will depend on how close we are to the natural free-oscillation frequency of the ball- spring system Resonance
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E/M radiation waves with frequency ~10 6 Hz has big effect on mobile electrons in the metal of radio antenna: can tune radio to a single frequency E/M radiation with frequency ~ 10 15 Hz has big effect on organic molecules: retina in your eye responds to visible light but not radio waves
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This note was uploaded on 04/02/2008 for the course PHYS 272 taught by Professor K during the Winter '07 term at Purdue University-West Lafayette.

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Lecture_27_Part_2 - Effect of E/M Radiation on Matter 1....

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