(a(i))[2]
State what the photoelectric effect means.
(a(ii))[1]
State what work function energy means.
(b(i))[1]
A polished calcium plate in a vacuum is studied by shining light on its surface. It is observed that no photoelectric current is produced when the frequency of the light is less than $6.93 \times 10^{14}\,\text{Hz}$. State the name of the frequency below which no photoelectric current is produced.
(b(ii))[3]
Explain how the photon model of electromagnetic radiation accounts for the observation.
(b(iii))[2]
Calculate the work function energy, in $\text{eV}$, for calcium.