Explain what is meant by the photoelectric effect in this context.
One wavelength of electromagnetic radiation from a mercury vapour lamp is $436\,\text{nm}$. Calculate the photon energy associated with this wavelength.
Light from the lamp in (b) is shone, separately, onto the surfaces of caesium and tungsten metal. The work function energies of caesium and tungsten metal are shown in Fig. 10.1. Calculate the threshold wavelength for photoelectric emission from caesium.
Calculate the threshold wavelength for photoelectric emission from tungsten, using the work function value given.
Use your answers in (c) to state and explain whether radiation of wavelength $436\,\text{nm}$ from the mercury lamp will produce photoelectric emission from each metal: caesium and tungsten.