Einstein Photoelectric Theory

Einstein's Photoelectric Equation

At the threshold frequency, kinetic energy = 0, then

Work function

The minimum energy required for a photoelectron to be emitted from a metal surface

Work function equation

Threshold frequency

The minimum frequency for a light photon to produce photoelectric effect

The work function of cesium

2.14 electron volt

The work function of lithium

2.14 electron volt

Maximum wavelength of cesium to produce photoelectric current

579 nm

Maximum wavelength of lithium to produce photoelectric current

496 nm

Applications of photoelectric effect

1. Solar panel 2. Light detectors at the automatic doors 3. The image sensor in high-resolution cameras