Answer: -13.6/n² eV.
- A -13.6/n² eV
- B -13.6n² eV
- C 13.6/n² eV
- D 13.6n eV
Correct answer: A. -13.6/n² eV
Explanation: En = -13.6/n² eV. Negative means bound state. Ground state (n=1): -13.6 eV.
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.