3B SCIENTIFIC PHYSICS 1000913 Instructions D'utilisation page 5

3B SCIENTIFIC ® PHYSICS
Fluorescent sodium tube on heater panel 1000913
Instruction manual
02/14 ALF
1. Safety instructions
Danger: risk of burns. The heater panel and view-
ing window can reach temperatures of up to
300°C during operation.
•
Place the heater on a heat resistant surface.
•
In order to move it when in operation, do not
hold the heater except by its insulated handle.
•
Allow the equipment to cool before disman-
tling the experiment.
2. Description
The fluorescent sodium tube is designed to
demonstrate resonance fluorescence in sodium.
The highly evacuated, argon-filled glass tube,
with multiple distilled sodium coating is mounted
on a panel with a viewing window and is in-
tended for operation with the heater for the
Franck-Hertz experiment.
The entire tube lights up, emitting the yellow Na
D line, when heated up and illuminated by light
with the sodium spectrum. If however, it is illu-
minated by white incandescent light, the spec-
trum of the transmitted light exhibits a dark ab-
sorption line where the Na D line would be.
1
1
Sodium tube
2
Front/heater panel
3
Viewing window