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”