Answer: Momentum.
- A Kinetic energy
- B Speed
- C Momentum
- D Velocity
Correct answer: C. Momentum
Explanation: The de Broglie relation is λ = h/p. Equal wavelengths therefore imply equal magnitudes of momentum.
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.