(a)[2]
The Sun is the source of solar energy. Tick the box beside the resources whose energy also comes from the Sun: coal, geothermal, hydroelectric, nuclear, wind.
(b(i))[2]
Explain why copper is used for the tubes and why they are painted black.
(b(ii))[3]
Calculate the amount of thermal energy gained by the water in $5.0\,\text{s}$.
(b(iii))[2]
Calculate the power of the solar radiation falling on the panel.