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

Product No: P2510402

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

Materiallist (Excerpt)	Product	Amount
Interference filters, set of 3	08461-00	1
Interference filters, set of 2	08463-00	1
Universal measuring amplifier	13626-93	1
Photocell for h-determination, with housing	06779-00	1
Power supply 0...12 V DC/ 6 V, 12 V AC, 230 V	13505-93	1
Rheostat, 100 Ohm , 1.8A	06114-02	1
Experiment lamp 5	11601-00	1
DMM with NiCr-Ni thermo couple	07122-00	2
Connecting cord, 32 A, 1000 mm, blue	07363-04	1
Connecting cord, 32 A, 500 mm, red	07361-01	4
Connecting cord, 32 A, 500 mm, blue	07361-04	3
Connecting cord, 32 A, 500 mm, yellow	07361-02	1
Connecting cord, 32 A, 500 mm, black	07361-05	2
Laboratory Experiments Physics, Chemistry, Biology andApplied Sciences, CD-ROM, incl. operating manuals	16502-42	1