(a(i))[2]
State the meaning of threshold frequency.
(a(ii))[2]
Calculate platinum’s threshold frequency.
(b)[2]
A continuous spectrum of electromagnetic radiation with wavelengths from $300\,\text{nm}$ to $600\,\text{nm}$ is shone, one metal at a time, onto each metal listed in Fig. 7.1. Determine which metals, if any, will produce electron emission.
(c)[3]
When light with a given intensity and frequency strikes a metal surface, electrons are emitted. State and explain what happens, if anything, to the rate at which electrons are emitted from this surface when light of the same intensity but a higher frequency is used.