What is a work function in physics?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
The work function (φ) is the minimum energy required to remove an electron from a solid's surface to a point just outside. Key points:
- Symbol: φ (phi) or W
- Unit: Electron volts (eV) or joules
- Application: Photoelectric effect, thermionic emission
- Formula: Energy of incident photon - work function = kinetic energy of ejected electron (hν = φ + KE)
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