The number of photoelectrons emitted per second depend on the incident radiation

Hint: We know about the term photoelectric effect. It is an effect where electrons are emitted when an electromagnetic material hits a material. We will use the concept of photoelectric effect and arrive at the answer.

Complete step by step solution:
First of all, we know that in case of photoelectric effect a radiation hits a material then electrons are emitted
The number of photoelectrons depend on the number of photons emitted when an electromagnetic radiation hits the material.
That is no of photons incident per second is termed as intensity.
Hence, the number of photoelectrons emitted depends on the intensity of the incident radiation.

Additional information: There is a certain potential below which the emission of electrons does not take place that is the work function. The energy of incident radiation has to be greater than the woRk function for the ejection of electrons.

Note: One should keep in mind that one electron is emitted because of one photon. This means that number of photons or the intensity of emitted photoelectrons is proportional to the intensity of the incident photons. One may think that the intensity of the emitted photoelectrons (or the photo current) is proportional to the energy of the incident photons but that is not true. So that should be kept in mind.