Answer: 2.43 pm.
- A 2.43 pm
- B 1.22 pm
- C 0 pm
- D 4.86 pm
Correct answer: A. 2.43 pm
Explanation: The Compton wavelength shift is Δλ = h/(m<sub>e</sub>c)(1 - cosθ). For θ = 90°, cosθ = 0, so Δλ = 2.43 pm.
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.