Lecture18

Lecture18 - Major Concepts in Physics Lecture 18 Prof Simon...

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PHY102 1 Major Concepts in Physics Lecture 18. Prof Simon Catterall Office 309 Physics, x 5978 [email protected] http://physics/courses/PHY102.08Spring
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PHY102 Recap ± Discussed how crises in late 19 th physics led to new ideas about light/matter ² Sometimes light behaves not as a wave but as a particle – the photon with E=hf ² Similarly Bohr model for H atom suggests that electron (a particle) sometimes behaves as a wave ! λ= h/p, p=mv Wave-particle duality
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PHY102 Direct confirmation of wave nature of electron ± If electron behaves as wave – we should be able to make it undergo diffraction and interference ! ± Demo – electron diffraction ± Wavelength ? Very small . ± Application . . Electron microscope. Can resolve structures about size of wavelength
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PHY102 Electron pattern on L, X-ray on R
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PHY102 Example (text problem 28.4): What are the de Broglie wavelengths of electrons with the following values of kinetic energy? (a) 1.0 eV and (b) 1.0 keV. (a) The momentum of the electron is
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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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Lecture18 - Major Concepts in Physics Lecture 18 Prof Simon...

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