Teachers Laboratory Working Group

Aristides Tsirimiagos 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 Operational Testing of Video Conferencing Capability Brainstorm Lab arrangement and equipment Investigate additional Labs

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

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

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.

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.

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. E-mail to Phywe, as of yet answered

Phywe Millikan Apparatus (2/2)

Electron Diffraction (1/2)

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)

Electron Spin Resonance (1/2)

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

It is now time for a Video Conference

YOU have Just Witnessed a Successful Operational Test Video Conferencing YOU have Just Witnessed a Successful Operational Test

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

Largeur: 41 cm Profondeur: 51 cm Hauteur: 63 cm IKEA SWISS (1/2) Galant Jonas Jules Dimensions du produit Largeur: 41 cm Profondeur: 51 cm Hauteur: 63 cm CHF 79.00 Dimensions du produit Largeur: 56 cm Profondeur: 56 cm Larg. assise: 44 cm Prof. assise: 42 cm Haut. assise min.: 41 cm Haut. assise max.: 53 cm CHF 69:00 Dimensions du produit Longueur: 160 cm Largeur: 80 cm Hauteur: 72 cm Epaisseur: 2 cm Or… Longueur: 120 cm Largeur: 60 cm Hauteur: 72 cm Epaisseur: 2 cm CHF165 - 211

Ikea Furniture Cost estimate (2/2) Articles Nr Price/art Price Galant tabels 6 200 1200 Jules chairs 10 79 790 Jonas 69 414 Total SF 2404

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

Franck Hertz Demonstrates the energy levels in atoms There is a similar device from Didactic but we were unable to get a picture. This one is from Phywe.

Deflection of  - particles in magnetic field – relativistic speed

Two Electron Spectra w/Prism Spectrometer Hg, Cd and Zn Sprectra This is a Phywe product,

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