Answer: 1.23 Å.
- A 0.123 Å
- B 1.23 Å
- C 12.3 Å
- D 123 Å
Correct answer: B. 1.23 Å
Explanation: λ = 12.27/√V Å = 12.27/√100 = 1.23 Å.
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.