Stopping Potential

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Stopping potential V0 relates to K_max by?

RankGuru · Accepted Answer

1. **Definition of Stopping Potential ($V_0$)**: The negative potential applied to the collector plate that is just sufficient to stop the fastest moving photoelectrons from reaching it.
2. **Energy Relation**: At the stopping potential, the work done by the retarding electric field on the electron must equal its maximum kinetic energy.
3. **Equation**: $W = qV \implies$ Energy $= e V_0$.
4. **Final Link**: $K_{max} = e V_0$.
5. **Combined Equation**: $e V_0 = hf - \phi$, which allows for experimental determination of Planck's constant.

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Stopping Potential

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