(a)[1]
State what this phenomenon is called.
(b(i))[2]
If electrons are to be emitted, the ultraviolet radiation must have a frequency of at least $8.8 \times 10^{14}\ \text{Hz}$. Calculate the work function energy of magnesium.
(b(ii))[3]
For ultraviolet radiation with a frequency of $11 \times 10^{14}\ \text{Hz}$, calculate the maximum speed of the emitted electrons.
(c)[3]
The ultraviolet frequency $f$ incident on the magnesium sheet is varied 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 changes with $f$.