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

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