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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 - PowerPoint PPT Presentation
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Teachers LaboratoryTeachers 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• Operational Testing of Video
Conferencing Capability• Brainstorm Lab arrangement and
equipment• Investigate additional Labs
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
Operation Unit
Cathode Ray Tube
Power supply
• CRT- Electron accelerator
• Braun-Thomson-1897
• Deflection by electrical and (or) magnetic field
• Demonstration experiment
Magnetic CoilsSupply
Cathode Ray (Braun’s) Tube
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. 2)(
2
Ikr
U
m
e
e
kg
sA
m
e
e
111076.1
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.
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
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
Dimensions du produit
Largeur: 41 cmProfondeur: 51 cm
Hauteur: 63 cmCHF 79.00
Dimensions du produitLongueur: 160 cmLargeur: 80 cmHauteur: 72 cmEpaisseur: 2 cmOr… Longueur: 120 cmLargeur: 60 cmHauteur: 72 cmEpaisseur: 2 cmCHF165 - 211
Dimensions du produitLargeur: 56 cmProfondeur: 56 cmLarg. assise: 44 cmProf. assise: 42 cmHaut. assise min.: 41 cmHaut. assise max.: 53 cmCHF 69:00
Galant Jonas JulesIKEA SWISS (1/2)
Ikea Furniture Cost estimate (2/2)
Articles Nr Price/art Price
Galant tabels
6 200 1200
Jules chairs
10 79 790
Jonas 6 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
Deflection of - particles in magnetic field – relativistic speed
Equipment available at ŅKPT NaturfagÓ, Norway (http://kptnaturfag.no/shop/Fysikk/cat224)
Two Electron Spectraw/Prism Spectrometer
Hg, Cd and Zn Sprectra
Γεια σας (Yia sas)
Takk for oppmerksomheten!
Multumim pentru atentie
結束,謝謝 (Jie Shu, Xie Xie)“That’s all Folks”