Answer: Momentum increases.
- A Speed decreases
- B Momentum increases
- C Mass decreases
- D Frequency decreases
Correct answer: B. Momentum increases
Explanation: lambda = h/p. If momentum p increases (higher speed or mass), wavelength decreases.
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.