Answer: r = a₀.
- A r = 0
- B r = a₀
- C r = 2a₀
- D r = 4a₀
Correct answer: B. r = a₀
Explanation: Radial probability P(r) = |psi|² × 4pi r² peaks at a₀ (Bohr radius), even though |psi|² is maximum at r=0.
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.