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Modern Physics (PC300)

Modern Physics (PC300). Class #9: Introductory Stuff towards Quantum Mechanics. Quantum Homework Questions. Photoelectric Also some from Thornton and Rex–. "Yeah, well I got mine first. Due Wednesday. Experimental basis for the introduction of a quantum theory.

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Modern Physics (PC300)

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  1. Modern Physics(PC300) Class #9: Introductory Stuff towards Quantum Mechanics

  2. Quantum Homework Questions Photoelectric Also some from Thornton and Rex– "Yeah, well I got mine first Due Wednesday

  3. Experimental basis for the introduction of a quantum theory. • Photoelectric Effect – Almost done • X-Ray Production • Charge/mass of an electron • Blackbody Radiation • Stefan-Boltzmann law • Wien’s Displacement Law • Ultraviolet Catastrophe • Review what we know about how gamma particles are absorbed by matter. • Photoelectric effect • Compton Scattering • Pair Production

  4. Photoelectric Effect - +

  5. Photoelectric Effect: Intensity Makes Sense: more photons - more electrons

  6. Photoelectric Effect: Frequency 1902: Lenard - Maximum KE does not depend on intensity 1905 Lenard - Nobel Prize

  7. Photoelectric Effect: Work Functions (Kmax)

  8. Various Work Functions http://www.youtube.com/watch?v=m55kgyApYrY 1923 Millikan - Nobel Prize Why do different metals have different work functions?

  9. Lab – Photoelectric Effect

  10. X Ray Production 1901 Roentgen - Nobel Prize

  11. EM Spectrum: X-Rays (Duane-Hunt Rule)

  12. X Ray Production

  13. 1897 - J.J.Thompson 1906 - Nobel Prize

  14. Measuring charge/mass (e/m) Electron beam Cathode Ray Cathode Ray Tube Derive in lab

  15. Lab ? - e/m setup

  16. 1909 - Robert Millikan Precise Measurement of e Oil Drop Experiment

  17. Black Body Radiation “An idealized object that absorbs all the electromagnetic radiation falling on it, regardless of frequency.” Early observations – hot metals

  18. Ultraviolet Catastrophe Classical Physics – Rayleigh-Jeans Law

  19. 1900 - Planck’s Law Unusual (Crick-Watson) type approach: -> Equation that fits data -> Make it work -> Could not justify finding 1918 Planck - Nobel Prize

  20. Lab – Blackbody Radiation Extension - Pasco Setup

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