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Modern Physics

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7A 10.10 - Photoelectric Effect

Demonstrates: Electrons moved by UV light
Description: A zinc plate is charged with a plastic rod and fur then discharged with UV light.

7A 10.11 - Photoelectric Effect

Demonstrates: Electrons liberated by UV light.
Description: A zinc plate is charged with a plastic rod and fur then discharged with UV light.

7A 10.12 - LED & Laser

Demonstrates: Photoelectric effect
Description: A laser is shone on an LED, and the voltage across the LED is measured. Different wavelengths of light will give different voltages.

7A 10.12a - LED & Laser 2

Demonstrates: Photoelectric effect
Description: Voltage is created across an LED at increasing levels until it lights; this will be Vmin. Lasers can be shone on a photoresistor to create current in the circuit and light the LED if they are the right frequency

7A 10.13 - Photoelectric Effect w/stopping potential

Demonstrates: By varying the electric field (by manipulating the potential across region of interest), electrons that would otherwise have enough energy to cross the gap are no longer able to.
Description: An old phototube attached to a circuit.

7A 20.10 - Poisson Spot

Demonstrates: Light as a wave
Description: A laser is shone onto a needlehead. When the shadow is viewed from far field concentric rings can be seen around the needlehead, and a bright spot will appear in the middle of the shadow.

7A 60.05 - Field Emission Electron Microscope (FEEM)

Demonstrates: Field Emission Microscope, Quantum Mechanics, Quantum Mechanical Tunneling, Tunneling.
Description: The Field Emission Electron Microscope (FEEM) demonstrates quantum mechanical tunneling of electrons. The magnification of a typical FEEM is approximately 500,000X. Its resolution is about 20 Angstroms.

7A 60.10 - Electron Diffraction

Demonstrates: Diffraction pattern of electrons.
Description: The electron diffraction tube is a complete unit.

7A 60.15 - Deflection Tube

Demonstrates: Cathode rays and electron deflection.
Description: A stream of electrons can be deflected by an electromagnetic field.

7A 70.10 - Microwave Tunneling

Demonstrates: Quantum tunneling effect
Description: A microwave is sent through a plexiglass prism. Initially the receiver will not be able to pick up the microwave, but as a second prism is brought close to the first, the receiver will pick up more of the wave.