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Photoelectric Effect Apparatus
Photoelectric Effect Apparatus

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Photoelectric Effect Apparatus
Our Price: $2,540.00

Availability: See Product Text For Shipping Time
Product Code: 2477

PLEASE NOTE: Advanced Physics Equipment is built-upon-order. We do not stock these items in house, but order them built when an order is placed. Build orders take approximately 90 days.

• Study electron photoemission from a metal surface

• Obtain the characteristic curves of a vacuum

• Explore the effect of illumination intensity using the
inverse square law

The Photoelectric Effect Apparatus allows the photoelectric emission from a mixed metal cathode in vacuum to be studied. It consists of a light-tight box connected to a control and measurement unit by shielded cables.

The light-tight box contains a vacuum phototube with a Cs/Sb cathode and a current-controlled incandescent lamp mounted on a slide operated from outside the box to vary the illumination of the phototube.

The control and measurement unit contains an adjustable highly stabilized lamp power supply. The current is indicated on a three-digit
display. A second, independent, highly stabilized voltage source controlled by a multi-turn potentiometer applies a precise dc extraction voltage to the phototube electrodes. The applied voltage is indicated on a three-digit display. The resulting photocurrent is measured by a sensitive amplifier and indicated on a 3-1/2-digit display.

The apparatus shows the linear relation between light intensity and emission current and demonstrates the space charge dominated and
saturation regions of the emission current relationship to the extraction voltage.

The control and measurement unit contains a highly stabilized lamp power supply adjusted by a multi-turn potentiometer.


Phototube: Type GD-51 Mixed metal vacuum tube (Cs/Sb), rated voltage: 24V
Integral sensitivity (white light): 100µA/Lm

Lamp: Incandescent lamp, 12V/5W

Control Unit: Lamp supply: 185mA—665mA, display resolution:
Electrode voltage supply: -25.5V—+23.5V display
resolution: 0.1V
Photocurrent amplifier ranges: 0—19.99µA x
0.01µA; 0—199.9µA x 0.1µA
Dimensions: 35cm x 26cm x 12cm
Weight: 4.5 kg

Light-tight Box: Slide range: 0.5 - 40.0cm, mm scale
Dimensions: 60.5cm x 12cm x 15cm
Weight: 3.8 kg

The light-tight box contains a vacuum phototube mounted on a slide operated from outside the box to vary the illumination.

The apparatus allows photocurrent vs. extraction voltage relationships to be investigated.

Download the instruction manual for the Photoelectric Effect Apparatus (pdf file)

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