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Light Emitting Diodes for Determination of Planck's Constant h

Light Emitting Diodes for Determination of Planck's Constant h

£122.49 exc. 20% VAT(£146.99 Inc. VAT)


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In stock now

  • 6 coloured light-emitting diodes and series resistors
  • Mounted on plate with stem
  • Different emission wavelengths for determining Planck's constant h
  • Useful for several experiment topics
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Light emitting diodes for determination of planck's constant h

This product consists of six coloured light emitting diodes (LEDs) on a mounting plate. Different emission wavelengths determine Planck's constant h by measuring the cut-off voltage as a function of the frequency of the emitted light.

The LEDs with series resistors are mounted on a base plate with a stem, so this item is sturdy and ready for use. Contact can be made from the rear via safety connector plugs.

The Light Emitting Diodes are for use under various experiment topics, including the energy of a photon. This item works alongside a DC-power supply, analogue multimeter and a stand base, all also available from Lab World.

Experiment topics

The Light Emitting Diodes for Determination of Planck's Constant h are relevant to the following experiment topics:

  • Energy of a photon
  • Mean emission wavelength for a light emitting diode
  • Characteristic of an LED
  • Cut-off voltage

Additionally Required

To complete your kit, you will require the following:

  • DC-Power Supply 0 - 20V, 0 - 5A (230V, 50/60Hz)


  • DC-Power Supply 0 - 20V, 0 - 5A (115V, 50/60Hz)
  • Analogue Multimeter, Escola 100
  • Stand base
  • Experiment leads

Technical Specification

  • Wavelengths: 465nm, 560nm, 585nm, 635nm, 660nm, 950nm
  • Series resistor: 100Ω
  • Max. voltage: 6V
  • Dimensions: approx. 115 x 115mm² 
  • Weight: approx. 0.25kg
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