1 | Teacher‘s Lab at CERN Teacher‘s Laboratory

2 | Teacher‘s Lab at CERN Teacher‘s Laboratory at CERN 5 classroom experiments –Cathode ray tube –Fine beam tube –Electron diffraction tube –Photoelectric effect –Electron spin resonance Video conference equipment Green wall

3 | Teacher‘s Lab at CERN Cathode ray tube Study cathode rays Deflection by electrical and (or) magnetic field Cathode ray tube = electron accelerator Example for oscilloscope and (no flat-screen) TV

4 | Teacher‘s Lab at CERN Cathode ray tube UAUA CathodeControl grid Anode Flourescent screen

5 | Teacher‘s Lab at CERN Fine beam tube / Thomson-experiment Study Cathode rays. Study Lorentz force. Study of the deflection of electrons in a magnetic field into a circular orbit. Determination of the specific charge of the electron.

6 | Teacher‘s Lab at CERN Fine beam tube / Thomson-experiment Electron gun Anode Magnetic field (dipole)

7 | Teacher‘s Lab at CERN Electron diffraction tube 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)

8 | Teacher‘s Lab at CERN Electron diffraction tube UAUA Cathode Control grid Anode Flourescent screen Graphite foil

9 | Teacher‘s Lab at CERN Photoelectric effect Verify the photoelectric effect. Calculate Planck’s constant h Show that the kinetic energy of the electrons is independent of the intensity of the light.

10 | Teacher‘s Lab at CERN Photoelectric effect CathodeCircular Anode V High pressure Mercury lamb Interference filters

11 | Teacher‘s Lab at CERN Electron spin resonance

12 | Teacher‘s Lab at CERN Electron spin resonance 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