photoelectric work function
Quick Summary
The photoelectric work function is the minimum energy required to remove an electron from the surface of a metal. This energy is crucial for understanding how light interacts with materials, specifically in the photoelectric effect.12
When light strikes a metal, if the light's photon energy exceeds the work function, electrons can be ejected from the metal's surface. The energy of these ejected electrons is independent of the light's intensity but is related to the light's frequency. This phenomenon is fundamental to technologies like photocells and was key to developing quantum theory. Typical work function values for metals range from two to five electron volts.341
Ask Britannica AI about this topic
Britannica doesn't have a full article on this topic, so we've curated a list of our relevant coverage.