Answer: work function.
- A work function
- B kinetic energy
- C potential energy
- D binding energy alone
Correct answer: A. work function
Explanation: The work function is the least energy needed to release an electron from the metal.
In the photoelectric setup, light striking the metal plate ejects electrons that cross the evacuated tube to the collector, producing a measurable current on the ammeter.
Concept context
Photoelectric effect, de Broglie waves, Bohr's model, atomic spectra.