Planck's Constant Apparatus by Unilab

Planck's Constant Apparatus by Unilab
B8H28615

Product code: B8H28615

GBP395
GBP474 inc VAT
Was 479
In stock

The Planck's Constant Unit can be used:

  • As a direct method that gives a reasonable order of magnitude value for Planck's constant, h
  • For the demonstration of photoelectric effect and the principle of applying a backing potential difference to reduce the anode current to zero

The unit contains a photo emissive Caesium Antimony cathode, with a spectral response of 185-650nm. When light of frequency, f, strikes the cathode, electrons of energy E=hf-W0 are released and would normally reach the anode, producing a current which can be registered on a very sensitive instrument such as a Picoammeter (B8G85756) or an Electrometer.

The potential difference from an internal PP3 (6F22)-type cell can be adjusted to a value V where the anode current is just reduced to zero. V is proportional to the frequency of light used. This apparatus enables values of V to be found for various frequencies of light selected by placing each of the colour filters in turn over the cell. A plot of V vs. f gives a reasonable straight line where the gradient is h/e.

The Planck's Constant Unit requires the following to operate:

  • Spacesaver Picoammeter (B8G85756)
  • PP3 Battery (B8R05410)
  • Easy-Read Meter (B8R02652)
  • 20V d.c. Attachment (B8H30919)
  • Colour Filters set of six (B8R05407)
  • Set of 3 Narrow band filters (B8R05408)

All of the required equipment for Planck's Constant can also be purchased together in the Planck's Constant Kit (B8H76701)

Further Information

Brand
Unilab
Curriculum Link
Atomic Physics & Radiation
Key Stage Suitability
Key Stage 4+
Product Type
Planck's Constant Unit
GBP395
GBP474 inc VAT
Was 479
In stock

The Planck's Constant Unit can be used:

  • As a direct method that gives a reasonable order of magnitude value for Planck's constant, h
  • For the demonstration of photoelectric effect and the principle of applying a backing potential difference to reduce the anode current to zero

The unit contains a photo emissive Caesium Antimony cathode, with a spectral response of 185-650nm. When light of frequency, f, strikes the cathode, electrons of energy E=hf-W0 are released and would normally reach the anode, producing a current which can be registered on a very sensitive instrument such as a Picoammeter (B8G85756) or an Electrometer.

The potential difference from an internal PP3 (6F22)-type cell can be adjusted to a value V where the anode current is just reduced to zero. V is proportional to the frequency of light used. This apparatus enables values of V to be found for various frequencies of light selected by placing each of the colour filters in turn over the cell. A plot of V vs. f gives a reasonable straight line where the gradient is h/e.

The Planck's Constant Unit requires the following to operate:

  • Spacesaver Picoammeter (B8G85756)
  • PP3 Battery (B8R05410)
  • Easy-Read Meter (B8R02652)
  • 20V d.c. Attachment (B8H30919)
  • Colour Filters set of six (B8R05407)
  • Set of 3 Narrow band filters (B8R05408)

All of the required equipment for Planck's Constant can also be purchased together in the Planck's Constant Kit (B8H76701)

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