Answer: 1×10⁻²⁷ kg·m/s.
- A 1×10⁻²⁷ kg·m/s
- B 1×10⁻³⁴ kg·m/s
- C 1×10⁻²⁰ kg·m/s
- D 6.6×10⁻⁷ kg·m/s
Correct answer: A. 1×10⁻²⁷ kg·m/s
Explanation: p = h/λ = 6.6×10⁻³⁴/6.6×10⁻⁷ = 1×10⁻²⁷ kg·m/s.
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.