Answer: h/λ.
- A h/λ
- B the product hλ
- C h/λ²
- D λ/h
Correct answer: A. h/λ
Explanation: Photon momentum p = h/λ.
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.