Al Tobias (wat4y) - Office: Gibson S123 & Physics 218, (434) 924-0538
Demonstrations are cataloged according to PIRA Bibliography
PLEASE REQUEST DEMOS WELL IN ADVANCE
Due to Physics Building renovations, the lead time to set up demo requests has increased due to the need to transport equipment across campus. Please be kind and let me know well ahead of time what you need.
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video - Electromagnetic RadiationPurpose:To demonstrate radiation of electromagnetic waves.Procedure:   The UNILAB Electrical Oscillation Apparatus is used to generate electromagnetic radiation. The setup is wired as shown in this schematic and in the images below. It is mounted on a wood poll so it is above the bench away from metal objects. The unit switch should be set to VHF. A single turn "inductance" is plugged directly into the unit connecting grid capacitor and the anode of the triode. The "inductance" and the stray capacitance of the unit are forming an Hartley oscillator circuit. +300V DC anode voltage is applied through a 1.5KΩ power resistor, using crocodile clip toward the grid end of the loop. 6.3V AC is applied to the filament. Produced oscillations are ~ 140 MHz. The oscillator is loosely coupled (3-5cm) to a λ/2 resonant antenna, mounted on a insulating stand. A λ/2 dipole with light bulb is used to detect and also to demonstrate polarization of the electromagnetic radiation. Hints:
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