(a(i))[2]
Explain the meaning of a photon.
(a(ii))[1]
Explain the meaning of work function energy.
(b(i))[2]
The work function energy of the metal surface is $\phi$. State an equation, in terms of $\lambda$, $\phi$ and $E_{\max}$, that shows conservation of energy for the photoelectric effect. Explain any additional symbols that you use.
(b(ii).1)[2]
Use your result in (i) and Fig. 7.1 to determine the work function energy $\phi$ of the metal surface.
(b(ii).2)[3]
Use your result in (i) and Fig. 7.1 to determine a value of the Planck constant.