(a)[2]
Explain what is meant by the term photoelectric effect.
(b)[2]
A wavelength of electromagnetic radiation from a mercury vapour lamp is $436\,\text{nm}$. Calculate the photon energy for this wavelength.
(c(i))[2]
The lamp light in (b) falls separately on the surfaces of caesium and tungsten metal. The work function energies of caesium and tungsten metal are listed in Fig. 10.1. Calculate the threshold wavelength for photoelectric emission from caesium.
(c(ii))[1]
Calculate the threshold wavelength needed for photoelectric emission from tungsten.
(d)[2]
Use your answers in (c) to state and explain whether radiation from the mercury lamp of wavelength $436\,\text{nm}$ will produce photoelectric emission from each of the metals: caesium and tungsten.