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3. Technical data
Dimensions:
Tube:
Heater panel:
Weight:
4. Operation
Attachment of the tube to the heater
•
Screw the heater panel with the tube to the
heater itself using the six knurled screws.
•
If you have the heater for the Franck-Hertz
experiment, remove the front panel of the
heater and screw on the panel with the so-
dium fluorescence tube in its place.
•
Make sure that the tube is located about 2 cm
above the heater element. If necessary, care-
fully push the tube up in its holder.
Fig. 1 Heater panel with sodium fluorescence tube
attached to heater
170 x 42 mm approx.
230 x 160 mm approx.
550 g approx.
5. Sample experiments
The following additional equipment is needed to
carry out the experiments:
1 Heater (230 V)
or
1 Heater (115 V)
or heater for Franck-Hertz experiment
1 Na spectral lamp
1 Choke ballast for spectral lamps (230 V)
or
1 Choke ballast for spectral lamps (115 V)
•
All experiments are to be carried out in a
darkened room.
5.1 Demonstration of sodium resonance
fluorescence
Experiment 1
•
Set up the Na spectral lamp about 10 cm to
the left of the heater, aligned with the viewing
window on the left. Do not yet turn on the cho-
ke ballast.
•
Turn on the heater and set it to a temperature
of about 220°C.
•
At a temperature of about 100°C, turn on the
spectral lamp. It will reach full intensity after a
few minutes.
From 180°C to 200°C mist-like movement inside
the tube in the sodium light from the spectral lamp
can initially be seen. The visibility of this "mist"
increases as the temperature rises until the whole
tube lights up with yellow sodium light.
Note 1: The ends of the metallic sodium reflector
inside the tube will move during the course of
the experiment. One thing that can improve the
situation is to align the tube such that the end
where condensation takes place is facing
downwards. In that case, the sodium "mist" can
be seen especially clearly at the top edge of the
metallic coating.
Fig. 2 Mist inside sodium light
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