alleryThe minimum energy needed to free an electron from a metal is its:
AWork function
BKinetic energy
CStopping value
DThreshold power
Answer & Solution
Correct answer: A. Work function
1. Electrons are bound inside the metal surface.
2. Some energy must be supplied before one can escape.
3. That minimum is the work function.
4. So the answer is work function.
_Source: syllabus Physics, Ch 11 'Dual Nature of Radiation and Matter'_
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