Planck constant

Experiment no.: 7.3.2
Plancksche Konstante Revised since 04/25
The maximum energy of electrons emitted by the photoelectric effect depends on the frequency of the light and not its intensity.
Comment: The electronics of this experiment was revised in April 2025, which now leads to better measurement results.

📄 Detailed experiment description

Images for this experiment

Overview
Side view
Measurement at 546 nm (green)
Measurement at 436 nm (blue)
Measurement at 405 nm (violet)
Measurement at 365 nm (UV)

Documents for this experiment

Properties of the 5 Hg lines
Braking voltage as function of frequency
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