Answer: Z-1.
- A Z
- B Z-1
- C Z²
- D Z+1
Correct answer: B. Z-1
Explanation: Moseley law: sqrt(f) = a(Z - b) where b is approximately 1 for K-alpha lines. So sqrt(f) proportional to (Z-1).
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.