Answer: Frequency only (and work function).
- A Intensity only
- B Frequency only (and work function)
- C Both frequency and intensity
- D Neither
Correct answer: B. Frequency only (and work function)
Explanation: Stopping potential V₀ = (hf - phi)/e. It depends on frequency f and work function phi, not 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.