3B30.30 B
ELL IN A
V
ACUUM
Version 1
The signal from a microphone next to a buzzer inside a vacuum chamber fades as the chamber is evacuated.
A video camera may be used to project the oscilloscope display in large classrooms.
Wear face shield while chamber is evacuated.
(inspect bell jar, tell instructor to open valve slowly)
(set power supply to 3.0 V)
Version 2
An amplifier and speaker are used in place of the oscilloscope.
Wear face shield while chamber is evacuated.
(inspect bell jar, tell instructor to open valve slowly)
(set power supply to 3.0 V)
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