Answer: no photoemission.
- A no photoemission
- B delayed emission
- C weak emission
- D strong emission
Correct answer: A. no photoemission
Explanation: Below the threshold frequency no photoelectrons are emitted regardless of intensity.
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.