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United Scientific™ Planck's Constant Apparatus
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S139521 Planck's Constant Apparatus
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Catalog No. S139521 Supplier United Scientific™ Supplier No. PLCN01
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Description

Apparatus that measures Planck’s constant and estimates the work function of cesium.

  • Compact, easy-to-use apparatus. Accurate results with less than 5% error.
  • Measures Planck's constant and estimates the work function of cesium.
  • The Planck's Constant Apparatus is a compact unit containing an enclosed vacuum photocell with an attachment for illuminating light sources, a high stability power supply for applying a variable stopping voltage to the cell and a nanoammeter for measuring the resulting photocurrents.
  • Light from five interchangeable narrow spectrum LEDs is applied to the photocell from a second integrated high stability power supply via an enclosed fiber optic connecting cable that plugs into the photocell enclosure so that the ambient illumination is excluded.
  • A maximum energy of the photons from each of the five LEDs in turn is measured by determining the stopping voltage for which the photocurrent becomes zero.
  • This occurs for the peak wavelength of each LED.
  • Results are evaluated by combining the wavelength and energies to allow a value for Planck's constant to be found.
  • The work function of the photocell cathode material can also be estimated.
  • This can be performed graphically, analytically, or using the included Microsoft Excel™ spreadsheet.
  • Planck's Constant Apparatus Specifications:
    • Photocathode Material: Cesium (Cs)
    • Voltmeter Display: 3.5 Digit, LCD, precision 0.5% (typical).
    • Ammeter Display: 3.5 Digit, LCD, precision 1% (typical).
    • Dimensions: 28 x 12 x 16 cm
    • Weight: Approx. 1 kg

Specifications

Product Type Planck's Constant Apparatus

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