Franck Hertz Experiment | Spectral Bands formation in Franck Hertz Tube

FRANCK HERTZ EXPERIMENT SK087

Exp-1 To observe the neon spectral bands formation in Franck-Hertz tube.
Exp-2 To record the Franck-Hertz characteristic curve for neon.
Exp-3 To study the effect of filament voltage and anode plate voltage on the characteristic curve..

Manual & automatic experiment mode.
Neon bands formation in frank-hertz tube can be visually observed.
Easy experiment setup.
Auto identification of sensors and graphical analysis in automatic mode with data logger.

Excitation energy.
Electron collision.
Kinetic energy.
Energy level.
Ionization energy.

Frank Hertz Apparatus (SK090- consisting of CD133 & CD152) can be operated in stand alone mode.

Principle and Working:
The Franck-hertz tube consists of an electron-emitting cathode, two mesh grids for accelerating electrons and an anode plate for collecting electrons. It is filled with a low pressure gas. The mesh grids provide the accelerating potential to electrons and the anode is held at slightly negative potential to provide braking. At low accelerating potential, the electrons gain kinetic energy and reach the anode plate with purely elastic collisions with the gas atoms. As accelerating potential is increased the gas atoms absorb energy as they are excited due to in-elastic collision by the energized electrons. Thus fewer electrons reach the anode plate and there is a dip in the plate current. These dips in current is observed at approximately fixed intervals of accelerating potential which demonstrate the presence of discreet or quantum energy levels in the Bohr’s model of atom.
In the present Franck-Hertz experiment with neon gas, the absorbed energy by neon atoms is released through photons having red-orange wavelength, which can be visually observed in band formations. The experiment can be performed in manual mode where the accelerating voltage and the plate braking voltage can be manually controlled in SK090. Also with sensors and data logger in Sk087 the accelerating voltage can be automatically varied and plate current measured & displayed graphically on PC.

Contents:

Cat. No.	Item Name	Qty.
CD133	Franck-Hertz unit	1
CD433	Data logger	1
C7994	Power supply for data logger	1
CD152	Neon tube with mount	1
CD435	Current sensor (± 100mA)	1
CD434	Voltage sensor (± 10V)	1
SN204	Flexible plug lead red	2
SN201	Flexible plug lead black	3
SN207	Flexible plug lead yellow	1
	USB cable	1
	Software CD disc	1

Franck Hertz Unit CD133
- SPECIFICATIONS Plate Current Display : 3½ digit LED
  Plate Voltage : 1.2-12V, Display 3½ digit LED
  Screen Grid (G2) Voltage : 0-80, Display 3½ digit LED
  Control Grid (G1) Voltage : 0-10V, Display 3½ digit LED
  Filament Voltage : 0-9V,Display 3½ digit LED
  Tube Connection : 4mm socket
  Voltage Inputs from DAC1 : 4mm safety socket
  Voltage output 10V : 4mm safety socket
  Current output 100nA : 4mm safety socket
  Mode : Manual or Data Logging
  Current gain & offset adjustment knob
Data Logger & Power Unit
- SPECIFICATIONS Data Logger CD433
  Input channels : 4, 6PIN BT (British Telecom)
  Input channels resolution : 12 bit ADC @ 100 ksps
  Analog input : 0-5 V
  Output channels : 12 bit DAC
  Analog output : ± 12 V max 10 mA
  Current booster : Upto 1 A
  Power Connector : 3PIN DIN
  Communication : USB
  POWER UNIT C7994
  Power Supply Input Voltage : 220V, 50Hz AC
  Power Supply output Voltage : ± 12 V, 3PIN DIN
Neon Tube CD152
- SPECIFICATIONS Filament voltage : 6 - 9 V
  Control voltage : 9V
  Accelerating voltage : Maximum 80 V
  Counter voltage : 1.2 -10 V
  Connection Out : 4mm safety socket
  Connection In : 4mm Plug
  Tube : 130 x 26 mm dia.
Voltage & Current Sensor
- SPECIFICATIONS VOLTAGE SENSOR CD434
  Voltage Sensor : ±10 V
  Connection out : 4mm safety socket
  Connection in : 6PIN BT (British Telecom)
  CURRENT SENSOR CD435
  Current Sensor : ±100nA
  Connection out : 4mm safety socket
  Connection in : 6PIN BT (British Telecom)

* Additionally Required:
Computer not supplied with this setup.

FRANCK HERTZ EXPERIMENT SK087

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