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)

or:

• 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

Do you have a question about this product or would like to purchase it? No problem at all. Simply call us on 020 7720 2266 between 09:00 and 17:00 Monday to Friday. 

You can also email us with your question by using the form below. A member of the Lab World Customer Care Team will respond to your enquiry personally as soon as they can.