Law of photo electric effect

Here are the laws of the photoelectric effect:

1. The photoelectric current is directly proportional to the intensity of the incident light, provided the frequency is above the threshold frequency.

2. There exists a minimum threshold frequency (ν₀) for each material below which no photoelectric emission occurs, no matter how intense the light.

3. The kinetic energy of the emitted photoelectrons increases linearly with the frequency of the incident light, once the threshold frequency is exceeded.

4. Photoelectric emission is an instantaneous process, occurring as soon as light strikes the surface (if the frequency is sufficient).