Work Function Definition
Work function φ of metal is?
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About This Question
- Subject
- physics
- Chapter
- dual nature
- Topic
- work function definition
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Minimum energy to remove surface electron
- 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.
- Physical Basis: Electrons are held within the metal by a potential barrier at the surface.
- Dependencies: The value depends on the nature of the metal and its surface condition (e.g., Cesium has a lower ϕ than Platinum).
- Measured in: Typically expressed in electron-volts (eV).
This medium difficulty physics question is from the chapter dual nature, covering the topic of work function definition. It appeared in the 2025 exam.
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