(a)[3]
State three separate pieces of evidence from the photoelectric effect that show electromagnetic radiation has a particulate nature.
(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 lead to the emission of photoelectrons. Explain your answer.
(c)[3]
Photons of 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 produced. Calculate the force acting on the metal surface due to the incoming photons.