Answer: particle.
- A particle
- B wave
- C fluid
- D magnetic
Correct answer: A. particle
Explanation: The instantaneous, frequency-dependent emission supports the particle (photon) model.
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.