Franck Hertz Experiment with Mercury

Franck-Hertz experiment will demonstrate the validity of the Principle of quantization of energy. This experiment was very
important, from a historical point of view, because it supplied
the experimental data for confirming Bohr model ; Bohr was the
first physicist being able to infer the diagram of the electronic
levels of an atom.
This experiment can be carried out with Franck-Hertz tube that
can use mercury or neon. Both these tubes need a specific
power supply and an oscilloscope.

COMPONENTS
Franck-Hertz tube with mercury filling and heater
power supply unit

FRANCK-HERTZ TUBE WITH MERCURY FILLING AND HEATER
Free electrons will collide with mercury atoms and generate
energy in quantized packets. Excitation energy can be
determined via a cathode-ray tube under vacuum filled
with mercury gas, and some parallel fl at electrodes that
avoid distortions of field lines. Electrodes include a cathode
with oxides, heated indirectly and pierced to produce a
homogeneous electric field, besides an anode grid and a
collector electrode. This tube will be heated by a special heater,
to increase the probabilities of collisions between electrons
and mercury atoms. This heater is used to attain the vapour
tension inside the tube filled with mercury: it consists of a
metal box with silk-screen-printing diagram, ceramic insulated
sockets for connections, display windows, an orifice for
inserting a thermometer, insulated handle, and it also includes
a thermostat for adjusting temperature.

Characteristics
Heater: 4-12 Vac/dc
Grid voltage: 0-70 V
Temperature range: 160-240°C
Working temperature: 200°C
temperature accuracy: ±5°C
Dimensions: 240 x 169 x 150 mm
Weight: 3.5 kg

POWER SUPPLY UNIT FOR FRANCK-HERTZ EXPERIMENT
This unit will supply the necessary voltage for powering tubes and
it also includes a DC amplifier for measuring collector current.
Acceleration voltage is output by the power supply unit; inputs
are available for anode current and acceleration voltage.

Characteristics
Filament voltage: 4-12 V, variable continuously
Control voltage: 9 V at 10 mA
Acceleration voltage: 0-80 V
Operating modes: manual, variable continuously
Voltage control: 1.2 – 10 V, variable continuously
Analog outputs
Output signal: 0-12 V at 7 nA/V
Connections: through sockets of 4 mm
Dimensions: 160 x 132 x 210 mm

Physical Structure of Matter Franck Hertz Experiment with Mercury Manufacturer,Supplier and Franck Hertz Experiment with Mercury Exporter in India