The photoelectric effect (AQA A-Level Physics): Flashcards

Photoelectrons emitted from metal when light above threshold frequency

Min. frequency needed to emit photoelectrons; varies by metal

$E = hf$

$6.63 \times 10^{-34}$ J s

One photon at a time

Min. energy to remove electron from metal surface

Voltage needed to stop photoelectrons with max. KE

$E_{k(\text{max})} = eV_s$

$hf = \phi + E_{k(\text{max})}$

More photoelectrons emitted; max KE unchanged