Lecture13

Lecture13 - Major Concepts in Physics Lecture 13. Prof...

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PHY102 1 Major Concepts in Physics Lecture 13. Prof Simon Catterall Office 309 Physics, x 5978 smc@physics.syr.edu http://physics/courses/PHY102.08Spring
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PHY102 Plan for today - review ± Topics ± Practice exam
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PHY102 Anouncements ± Exam 2 – Wednesday March 5 in class ² Online: exam sample plus solutions, homework2 solutions, quiz 2 solutions ² Material: everything from lecture 8-12 inclusive (thermal radiation, line spectra, color mixing, ray approx, reflection, refraction, mirrors, lenses, polarization) ² Similar in format/style/grading to exam 1 ² Review session in class on Monday March 3
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PHY102 Thermal radiation etc ± Be able to define blackbody: Idealized object that absorbs/emits most efficiently any EM wave ± Stefan’s law: amount of energy emitted/absorbed every second by blackbody E= σ AT 4 – T in Kelvins !! A in m 2 ± Wien’s law: peak of intensity distribution occurs at wavelength λ T=2.898x10 -3
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PHY102 Line spectra ± Blackbody spectrum applies to dense matter comprising many types of atoms. ± Single atoms give rise to discrete line spectra which give unique fingerprint of atom in question.
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PHY102 Color mixing ± Eyes sensitive to 3 colors: red, green and blue – primary colors. RGB cone sensitivity to light
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PHY102 Adding color ± Two ways to perceive yellow light 1. Light of wavelength 580 nm hits retina 2. Equal amounts of red and green light hit retina ± Know how to add primaries R+G=Y, R+B=M, G+B=C, R+G+B=W ± Know how a color filter works – by allowing through only certain colors ± Combine filters: eg. Y(filter)+M(filter)=?
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PHY102 Rays … ± When λ << sizes can ignore diffraction effects and treat light as following straight line paths
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This note was uploaded on 05/18/2008 for the course PHY 102 taught by Professor Simoncatterall during the Spring '08 term at Syracuse.

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Lecture13 - Major Concepts in Physics Lecture 13. Prof...

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