Answer: n².
- A n
- B n²
- C 1/n²
- D 1/n
Correct answer: B. n²
Explanation: Bohr radius: rn = n² × a₀ where a₀ = 0.529 Angstrom (Bohr radius). rn is proportional to n².
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.