work function definition

Question

Work function φ of metal is?

RankGuru · Accepted Answer

1. **Definition**: The work function is the minimum amount of energy required for an electron to escape from the surface of a metal against the attractive forces of the ions.
2. **Physical Basis**: Electrons are held within the metal by a potential barrier at the surface.
3. **Dependencies**: The value depends on the nature of the metal and its surface condition (e.g., Cesium has a lower $\phi$ than Platinum).
4. **Measured in**: Typically expressed in electron-volts (eV).

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work function definition

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