Pages in this set
THE PHOTOELECTRIC EFFECT
Put a clean zinc plate (zinc has a lowish work function) on the top of a goldleaf electroscope.
Charge the zinc plate negatively (e.g. with the negative terminal of a very high PD power supply, also
known as an EHT supply). The gold leaf rises…
in metal with KE = 2eV with KE = 1.5eV
The maximum KE of the emitted photoelectron will be equal to photon energy work function.
KEmax = hf
At the threshold frequency, fo, KEelectron = 0 (the electrons are only just released). This means that the
What can't be explained by a wave model?
A wave model can explain why the effect happens, as the wave supplies energy to releases electrons. It
The existence of a threshold frequency e.g. why bright visible light doesn't work but dim UV light
does. Bright visible light delivers…