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Planck’s Constant Apparatus Manufacturer,Supplier and Exporter in India

Planck’s Constant Apparatus

Product Code : EL-AANP-10622

Quick Answer: This Planck's constant experiment unit is a ready-built circuit for measuring the photoelectric effect, with a caesium antimony cathode and a digital display of the retarding voltage.

Last updated: October 2026

Key Features

  • Photocell with caesium antimony cathode, spectral response range 185 to 650nm
  • DC stopping potential set by a 10-turn potentiometer
  • DC voltmeter with 0 to 19.99V LED display
  • 6 narrow-band filters with an FWHM bandwidth of 4 to 15nm
  • Female UHF socket and a 4mm lead for connecting a picoammeter
  • Powered by a 9V PP3 battery

Technical Specifications

SpecificationValue
PhotocellCaesium antimony cathode
Spectral response185 to 650nm
Power source9V PP3 battery
Stopping potential control10-turn potentiometer
Voltmeter0 to 19.99V LED display
Filters6 narrow-band, FWHM 4 to 15nm
Picoammeter connectionFemale UHF socket
Dimensions205 x 150 x 115mm (W x H x D)

About This Product

Inside the unit are the caesium antimony cathode, a DC power supply and a potentiometer that applies a variable retarding voltage to the photoelectric circuit. Coloured filters are changed to vary the frequency f of the light, and the retarding voltage is read on the digital display. The unit is designed to be used with a picoammeter, which connects through the lead supplied. Export enquiries for the Planck’s Constant Apparatus are welcome from Burkina Faso, Kyrgyzstan, Egypt, Uganda, Australia and Timor-Leste.

Frequently Asked Questions

What does the Planck's Constant Apparatus contain?

A caesium antimony cathode, a DC power supply with a potentiometer for a variable retarding voltage, and a digital display of that voltage.

How is the frequency of the light changed?

Six coloured filters are provided to vary the value of f.

What else is needed?

It is intended for use with a picoammeter, connected through the female UHF socket and the 4mm lead included.

Related: Atomic and Nuclear Physics, Digital Voltmeter/Ammeter With Shunts and Dual Beam Tube D.

For a quotation on the Planck’s Constant Apparatus, contact Didactic Lab.


   
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Planck’s Constant Apparatus
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