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Physics · 术语表

什么是 Stopping potential？

Definition 34.5 High School Physics · 第 34 章 — The Quantum World: Photons and Energy Levels

To measure $E_{k,\max}$ , a reverse voltage brakes the electrons (Chapter 14); the stopping potential $U_s$ is the smallest voltage canceling the current: the fastest electrons just fail to cross, so $E_{k,\max} = e\,U_s$ .

Measured E_k, = eU_s against frequency (sodium): a straight line of slope h, cutting the axis at _0; extrapolated (dashes), it reveals -W_0 at = 0. — Measured $E_{k,\max} = eU_s$ against frequency (sodium): a straight line of slope $h$ , cutting the axis at $\nu_0$ ; extrapolated (dashes), it reveals $-W_0$ at $\nu = 0$ .

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