By reference to the photoelectric effect, explain what is meant by work function energy.
In an experiment, electromagnetic radiation of frequency $f$ is incident on a metal surface. The results in Fig. 10.1 show how the maximum kinetic energy $E_{\text{MAX}}$ of electrons emitted from the surface varies with frequency $f$.
Determine the work function energy in $\text{J}$ for the metal used in the experiment.
The work function energy in $\text{eV}$ for some metals is listed in Table 10.1. Determine the metal used in the experiment. Show your working.
For one particular frequency in (b), the intensity of the electromagnetic radiation is increased. State and explain the change, if any, in the maximum kinetic energy of the emitted electrons.
For one particular frequency in (b), the intensity of the electromagnetic radiation is increased. State and explain the change, if any, in the rate of emission of photoelectrons.