What is the work function of a metal?
AThe total energy of all emitted electrons
BThe minimum energy required by an electron to just escape from the metal surface
CThe minimum intensity of light needed for emission
DThe kinetic energy of the fastest emitted electron
Answer & Solution
Correct answer: B. The minimum energy required by an electron to just escape from the metal surface
The notes define work function $\phi_0$ as the minimum energy required by an electron to just escape from the metal surface. It is a property of the material.
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