1. Teachers Laboratory
Working Group

2. Aristides Tsirimiagos
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: 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

5. 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

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.
to Phywe, as of yet answered

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. Electron Spin Resonance (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. YOU have Just Witnessed a Successful Operational Test
Video Conferencing
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. 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 CHF

18. 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

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

20. 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.

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

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

23. 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”