Answer: h/p.
- A h/p
- B hp
- C h/p²
- D p/h
Correct answer: A. h/p
Explanation: De Broglie: lambda = h/p where h = Planck constant and p = momentum. Applies to all matter.
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.