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Planck's

Planck's "quantum of action" and photoelectric effect (line separation by interference filters)

Item no.: P2510402

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Principle

A photocell is illuminated with monochromatic light of different wavelengths from a filament lamp with interference filters. The maximum energy of the ejected electrons in the photo-cell depends only on the frequency of the incident light, and is independent of its intensity. The stopping voltage Uo at different light frequencies is determined by the U/I caracteristics of the photocell and plotted over the corresponding light frequency f. Planck's quantum of action or Planck's constant (h) is determined from this graph .

Tasks

To determine Planck's quantum of action from the photoelectric voltages measured at different wave lengths

What you can learn about

  • External photoelectric effect
  • Work function
  • Absorption
  • Photon energy
  • Anode
  • Cathode

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