Experiment Hh-03
Brownian Motion
Description: The
stage of a microscope is fitted with a small cell which can transmit light. After
the microscope is focused, the television hookup is set on the ocular of the microscope.
The cell is filled with smoke from a cigarette or an extinguished match, closed
and placed on the stage. Laser light is aimed through the cell to illuminate the
smoke particles. Once the original turbulence subsides (about 5 minutes), the
chaotic motion of these particles can be observed on the television.
Demonstration
setup: the microscope (left) and laser (right) have been adjusted so that the
laser light is horizontal to the lab bench and passes through the gas cell.
Smoke
particles illuminated by laser light.
Materials: microscope
with TV hookup, TV, laser, gas cell, source of smoke (cigarette or match)
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