Answer: Only specific quantized orbits.
- A Any orbit
- B Only specific quantized orbits
- C Only the lowest orbit
- D Orbits determined by voltage
Correct answer: B. Only specific quantized orbits
Explanation: Bohr's postulate: electrons can only occupy specific quantized orbits where angular momentum = n x h/(2pi).
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.