The photoelectric effect is affected by several key features and factors that play a crucial role in understanding and analyzing the phenomenon:

1. Intensity and Frequency of Incident Light: The intensity and frequency of the incident light have a direct impact on the photoelectric effect. Increasing the intensity of the incident light leads to a larger number of photons striking the material, resulting in a higher photoelectric current. On the other hand, changing the frequency of the incident light affects the energy of the photons, which in turn influences the kinetic energy of the ejected electrons.

2. Work Function: Each material has a characteristic work function, which represents the minimum energy required to liberate an electron from the material's surface. If the energy of the incident photons exceeds the work function, the electrons can be ejected. Otherwise, no photoelectric effect occurs.

3. Stopping Potential: The stopping potential refers to the voltage at which the photoelectric current becomes zero. By varying the stopping potential, it is possible to measure the maximum kinetic energy of the ejected photoelectrons. The stopping potential is directly related to the difference between the energy of the incident photons and the work function of the material.

These key features and factors demonstrate the complex interplay involved in the photoelectric effect. Understanding and manipulating them allow scientists and engineers to harness this phenomenon in various practical applications such as photodetectors and solar cells.