(a)[3]
State three items of evidence from the photoelectric effect that support a particulate nature for electromagnetic radiation.
(b(i))[3]
Calculate the energy, in eV, of a photon of electromagnetic radiation with wavelength $380\,\text{nm}$.
(b(ii))[2]
Determine which metals will produce photoelectrons. Explain your answer.
(c)[3]
Photons with wavelength $380\,\text{nm}$ strike a metal surface normally at a rate of $7.6 \times 10^{14}\,\text{s}^{-1}$. Every photon is absorbed by the surface and no photoelectrons are emitted. Calculate the force exerted on the metal surface by the incident photons.