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Unformatted text preview: ISP209s8 Lecture 141 Today Announcements: HW#7 is due after Spring Break on Wednesday March 12 th Exam #2 is on Thursday after Spring Break The fourth extra credit project will be a super bonus points project. This extra credit can let your homework score go over 100% Light Waveparticle duality of nature Quantum Mechanics ISP209s8 Lecture 142 The Electromagnetic Spectrum Maxwells 4 equations describe the unity of electric and magnetic forces. They predict an electromagnetic wave that travels at the speed of c (3.00E+8 m/s) ISP209s8 Lecture 143 Wavelength and Frequency = 1.0 m Wavelength Frequency = 1/period Distance over which the wave repeats Number of cycles (repeats) per second. period = 2.0 s ISP209s8 Lecture 144 The Electromagnetic Spectrum PrenticeHall 2005 Speed = f wavelength f Frequency, Hz (1/period)(1/s) For light Speed c = 3.0E+8m/s ISP209s8 Lecture 145 What is Light? Wave Picture oscillating electric and magnetic fields Waves can interfere Examples 2slit interference diffraction 2slit interference diffraction ISP209s8 Lecture 146 Light as a particle Light also behaves like a particle Light comes in small bundles of energy we call photons Energy (of a photon) = h f h = 6.625E34 Js = 4.136E15 eVs= 4....
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 Spring '07
 Sherrill

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