Write any three experimental observations of photoelectric effect

Explanation

1. The photoelectric emission is an instantaneous process.
2. Above threshold frequency, the photoelectric current is directly proportional to the intensity of incident radiation.
3. Above the threshold frequency, saturation current is proportional to the intensity of the incident radiation and stopping potential is independent of intensity.
4. There exists a certain minimum cut-off frequency called .threshold frequency. below which no photo emission however intense the incident beam.
5. Above threshold frequency the kinetic energy of the photo electrons is directly proportional to the frequency of incident radiation and is independent of intensity.