Photoelectric Effect

Summary

Experiments show that electron emission based on frequency rather than intensity. In other words, $ν$ yields $e^{-}$ at a definite energy perportional to $ν$ and only after $ν_{0}$ and doesn’t depend on intensity. The number of electrons is dependent on intensity.

Takeaways

The electron’s energy is dependent on the frequency of the incident light
The number of electrons is dependent on the intensity of the incident light
Einstein (1905): $\frac{m v^{2}}{2} = ℏ ν - W$ , $W = ℏ ν_{0}$ .