db_lec15_post - PHYS 221 Last Lecture EM waves Properties...

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PHYS 221 LECTURE15 3/4/12 1 • Last Lecture EM waves Properties Speed of light EM spectrum Intensity, Momentum, and Radiation Pressure of EM waves • This Lecture • Light as a wave • Dispersion • Polarization D.Bortoletto PHYS221 c = 1 ε o μ 0 E = 1 o 0 B I (intensity) = 1 2 o cE 0 2 p (momentum)= E total (total energy) c P (radiation pressure) = I c
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3/4/12 2 Maxwell’s Equations (1865) D.Bortoletto PHYS221 If Q=I=0 the symmetry between E and B is even more apparent Φ E = Q inside ε 0 Φ B = 0 = E Δ L Closed path = ΔΦ B Δ t B Δ L Closed path = μ 0 I inside + 0 0 ΔΦ E Δ t Φ E = 0 Φ B = 0 E Δ L Closed path = ΔΦ B Δ t B Δ L Closed path = 0 0 ΔΦ E Δ t
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Electromagnetic spectrum 3/4/12 D.Bortoletto PHYS221 3 f λ =c
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3/4/12 4 Visible Light D.Bortoletto PHYS221 f λ =c
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Human eye 3/4/12 D.Bortoletto PHYS221 5 ~ 1850: infrared, visible, and ultraviolet light were the only forms of electromagnetic waves known . Visible light (human eye) frequency f ~ 10 15 Hz
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3/4/12 6 What a Bee Sees: D.Bortoletto PHYS221
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3/4/12 7 Dispersion The velocity of light in many media depends on the frequency.
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This note was uploaded on 03/20/2012 for the course PHY 221 taught by Professor Moffet,thomasj.–bortoletto,daniela during the Spring '12 term at Purdue University-West Lafayette.

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db_lec15_post - PHYS 221 Last Lecture EM waves Properties...

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