Answer: increases.
- A increases
- B decreases
- C stays constant
- D falls to zero
Correct answer: A. increases
Explanation: Since KE_max = hν − φ, a higher frequency raises the maximum kinetic energy.
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.