(a)[1]
State the name given to this phenomenon.
(b)
Electrons are emitted only if the frequency of the ultraviolet radiation is at least $8.8 \times 10^{14}\,\text{Hz}$.
(b(i))[2]
Calculate the work function energy of magnesium.
(b(ii))[3]
For ultraviolet radiation of frequency $11 \times 10^{14}\,\text{Hz}$, calculate the maximum speed of the emitted electrons.
(c)[3]
The frequency $f$ of the ultraviolet radiation striking the magnesium sheet is changed from $8.0 \times 10^{14}\,\text{Hz}$ to $11 \times 10^{14}\,\text{Hz}$. On Fig. 8.1, sketch how the maximum kinetic energy $E_{\text{MAX}}$ of the emitted electrons varies with $f$. Use the space below for any working you need.