Modern Physics PC 300 Class 8 Quantum Mechanics

Modern Physics (PC 300) Class #8: Quantum Mechanics Born

Test Assessment

Photoelectric Effect + -

Photoelectric Effect: Intensity

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

1905: Photoelectric Effect: Solution Classical electromagnetic theory has problems explaining the independence of Kmax and light intensity, the linear dependence of Kmax on light frequency and the instantaneous (10 -9 s) response of the photocurrent. Einstein - Light composed of irreducible "grains" - quanta (energy packets). 1905 What a year for Einstein http: //www. aip. org/history/einstein/chron-1905. htm 1921 Einstein - Nobel Prize

Photoelectric Effect: Work Functions (Kmax)

Various Work Functions http: //www. youtube. com/watch? v=m 55 kgy. Ap. Yr. Y 1923 Millikan - Nobel Prize

Problem Set for Wednesday To answer the first two questions you will first need to do a Simulation. Run the Photoelectric Effect program by following the steps below. P: AcademicWhitePC 301 Modern Physics 2013ProgramsPhotoelectric_en Take data to answer the following question. 1. Using five different wavelengths striking Sodium, calculate the ratio h/e. (Hint, make a graph in Excel of the Stopping Potential vs. frequency. Include this graph, with a trendline, in your homework solution. And remember, that all graphs need labels, a title, and a short caption…) 2. Find the Workfunction for each of the six elements (most of which are metals…including the unknown) used in the simulation. Make a simple chart of your findings. Write a few sentences that clearly describe what procedure you followed and how you arrived at these conclusions.

Sim #4: Photoelectric Effect P-DriveWhiteModern PhysicsProgramsPetutorCTWINX Click on Photo 15. ctb then hit OK

Lab 6 – Photoelectric Effect

X Ray Production 1901 Roentgen - Nobel Prize

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

Quantum Homework Questions Some Simulation Questions and an Electron Gun question Also… Thornton and Rex! Due Wed normal time "Yeah, well I got mine first

1897 - J. J. Thompson 1906 - Nobel Prize

X Ray Production

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

Lab ? - e/m setup

1909 - Robert Millikan Precise Measurement of e Oil Drop Experiment