From 486c6cc4daa406ddee6dba0cd896e3f4f6b1e0fe Mon Sep 17 00:00:00 2001 From: Andrew Lorimer Date: Mon, 3 Sep 2018 22:24:37 +1000 Subject: [PATCH] minor modifications to photoelectric notes --- physics/light-matter.md | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/physics/light-matter.md b/physics/light-matter.md index 6eed91f..a2d5f6d 100644 --- a/physics/light-matter.md +++ b/physics/light-matter.md @@ -46,6 +46,7 @@ particle model: - rate of photoelectron release is proportional to intensity of incident light - shining light on a metal "bombards" it with photons - no time delay +- one photon releases one electron #### Work function and threshold frequency @@ -68,9 +69,13 @@ $f$ is frequency of incident photon (**not** emitted electron) $\phi$ is work function ("latent" energy) Gradient of a frequency-energy graph is equal to $h$ -y-intercept is equal to $\phi$ +y-intercept is equal to $\phi$ +voltage $V$ in circuit is indicative of max kinetic energy in eV #### Stopping potential $V_0$ + +Smallest voltage to achieve minimum current + $$V_0 = {E_{K \operatorname{max}} \over q_e} = {{hf - \phi} \over q_e}$$ ## Wave-particle duality -- 2.43.2