Lecture17

Lecture17 - Major Concepts in Physics Lecture 17. Prof...

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PHY102 1 Major Concepts in Physics Lecture 17. Prof Simon Catterall Office 309 Physics, x 5978 smc@physics.syr.edu http://physics/courses/PHY102.08Spring
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PHY102 This week … ± Homework 4 – due in lab this week ± Homework 5 goes out
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PHY102 Problems for classical physics ± Classical theory says blackbody radiates an infinite amount of energy ± Atoms should radiate EM waves of all frequencies and should be unstable ± Photoelectric effect: electrons ejected from metal by light should have energies determined by light intensity not frequency ± ….
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PHY102 Partial resolution ± Planck/Einstein say that EM waves can sometimes be thought of as stream of photons each carrying energy E=hf ± h – new fundamental constant – Planck’s constant h=6.6x10 -34 Js ± h parametrizes quantum effects – ² h=0 Æ Newton correct ² h large Æ world would be very different ….
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PHY102 Line emission demo ± Each atom/element has its own characteristic pattern of emission lines – unique EM frequencies emitted after atom is excited
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PHY102 Light emitted by atoms
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PHY102 Fig. 27.14
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PHY102 Absorption spectrum ± Pass gas from white light source through a
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Lecture17 - Major Concepts in Physics Lecture 17. Prof...

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