Answer: 1:3.
- A 3:1
- B 1:3
- C 1:9
- D 9:1
Correct answer: B. 1:3
Explanation: Photon momentum is p = hν/c. Therefore the momentum ratio is p<sub>1</sub>:p<sub>2</sub> = ν:3ν = 1:3.
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.