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Eisco Planck's Constant Apparatus

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Brand: Eisco  MPN: PH1365 
  • Country of Origin: India
  • Free UK shipping available
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This apparatus is designed to determine the approximate value of Planck's constant, using a range of LEDs of known wavelength, to allow the electron/photon energy to be calculated. The apparatus includes 7 LEDs, covering the light range from deep blue at 470nm to near IR at 940nm, mounted on a box with 4mm sockets for attachment to a voltmeter and ammeter for voltage and current measurements. By monitoring the voltage at which each LED just begins to emit light, a graph of energy input as a function of light emitted frequency can be plotted and an approximate value of Planck's constant can be deduced.

  • Requires 9V DC power supply
Type Plancks Constant apparatus

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Planck's Constant

Reviewed by: Andy Goloskof - 24 June 2015
We need a class set, but prior to spending a lot of money three different units were purchased from various suppliers for appraisal. Although the basic circuitry is the same the one from Rapid was easily voted the easiest to use, best ergonomics , well made and by far the cheapest. This is a winner and a class set will be purchased in the new financial year. What a veritable bargain!