Answer: h/4π.
- A h/4π
- B h/2
- C h
- D h/2π
Correct answer: A. h/4π
Explanation: Uncertainty principle: Delta_x × Delta_px >= h/(4π) = hbar/2. Simultaneous precise position and momentum is impossible.
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.