(a)[3]
Explain why these dark lines are produced.
(b(i))[4]
Calculate the energy, in eV, of a photon with wavelength $435\,\text{nm}$.
(b(ii))[1]
On Fig. 8.2, draw an arrow to show the energy change that produces this dark line.
(c(i))[4]
Calculate the energy, in $\text{eV}$, of a photon with wavelength $435\,\text{nm}$.
(c(ii))[1]
On Fig. 8.2, draw an arrow to show the energy change that produces this dark line.