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Teachers Laboratory

Teachers Laboratory. Working Group. And the members are:. Tat Leong Lee Charles Merriam Avraam Popadopoulos Florin Serbu Ole Tennvassas Aristides Tsirimiagos. Tasks / Goals. Conduct The Six Existing Experiments Produce formal Lab Procedure for both set-up and conduct of the experiments

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Teachers Laboratory

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  1. TeachersLaboratory Working Group

  2. And the members are: Tat Leong Lee Charles Merriam Avraam Popadopoulos Florin Serbu Ole Tennvassas Aristides Tsirimiagos

  3. Tasks / Goals • Conduct The Six Existing Experiments • Produce formal Lab Procedure for both set-up and conduct of the experiments • Operational Testing of Video Conferencing Capability • Brainstorm Lab arrangement and equipment • Investigate additional Labs

  4. Doing The Labs • Aristides & Florin: • Oscilloscope and e/m apparatus • Charles & Ole: • Photoelectric Effect and Millikan Oil Drop • Avraam & Tat Leong: • Electron Diffraction and Electron Spin

  5. Cathode Ray Tube Power supply Operation Unit Cathode Ray (Braun’s) Tube • CRT- Electron accelerator • Braun-Thomson-1897 • Deflection by electrical and (or) magnetic field • Demonstration experiment Magnetic Coils Supply

  6. Determination of the Specific Charge of the Electron • Purpose: • Study Cathode rays. • Study Lorentz force. • Study of the deflection of electrons in a magnetic field into a circular orbit. • Determination of the magnetic field B as a function of the acceleration potential U. • Determination of the specific charge of the electron.

  7. Photoelectric effect • Purpose is to: • Verify the photoelectric effect. • Do measurements that enables us to calculate the kinetic energy of the electrons as a function of the frequency of the light. • Calculate Planck’s constant h from these results • Show that the kinetic energy of the electrons is independent of the intensity of the light.

  8. Millikan’s Oil Drop “Our Achilles Heel” (1/2) • Primary Problem focused on providing the actual Oil Drop: • How much oil, how many “squeezes” and connections • Need three hands to do the lab: • Squeeze, hold down & operate the polarity switch & stop watch--all while looking through eye piece: • Recommendations: eyepiece, Video camera and longer tube.

  9. Phywe Millikan Apparatus (2/2)

  10. Electron Diffraction (1/2)

  11. Electron Diffraction (2/2) • Determine the interplanar spacing of graphite using de Broglie relation and Bragg’s reflection • Related topics and concepts • Wave-particle duality (X-ray vs. electron) • Bragg’s reflection • Study small structure (inaccessible to optical)

  12. ElectronSpinResonance (1/2)

  13. Electron Spin Resonance (2/2) • Model of electron spin resonance demonstrating the interaction between the magnetic moment of the electron spin with a superimposed direct or alternating magnetic field • Related topics and concepts • Larmor precession • Revise resonance, gyroscope (not main focus) • Caveat • No classical equivalent to spin concept! • This is just to help student form some mental model

  14. It is now time for a Video Conference

  15. VideoConferencing YOU have Just Witnessed a Successful Operational Test

  16. Teacher’s Lab Requirements • New shorter tables • Storage: • Re-allocate existing Cabinets and/or • Build New Storage • New Power Supply Lines

  17. IKEA SWISS(1/2) Galant Jonas Jules Dimensions du produit Largeur: 41 cmProfondeur: 51 cmHauteur: 63 cm CHF 79.00 Dimensions du produit Largeur: 56 cmProfondeur: 56 cmLarg. assise: 44 cmProf. assise: 42 cmHaut. assise min.: 41 cmHaut. assise max.: 53 cm CHF 69:00 Dimensions du produit Longueur: 160 cmLargeur: 80 cmHauteur: 72 cmEpaisseur: 2 cm Or… Longueur: 120 cmLargeur: 60 cmHauteur: 72 cmEpaisseur: 2 cmCHF165 - 211

  18. Ikea Furniture Cost estimate (2/2)

  19. New Lab Recommendations • Franck Hertz (Neon) Apparatus • Deflection of beta-particles in magnetic field – relativistic speed • Atomic Spectra

  20. Franck Hertz

  21. Deflection of  - particles in magnetic field – relativistic speed

  22. Two Electron Spectraw/Prism Spectrometer Hg, Cd and Zn Sprectra

  23. Γεια σας (Yia sas) Takk for oppmerksomheten! Multumim pentru atentie 結束，謝謝 (Jie Shu, Xie Xie) “That’s all Folks”

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