(a)[2]
Complete the flow chart to show how a nuclear power station works. In each empty box, write the letter for the correct statement.
(b(i))[2]
An experiment needs a lamp with a light output of $70\text{ J s}^{-1}$. Determine the input power needed for the LED lamp and for the filament lamp to produce a light output of $70\text{ J s}^{-1}$.
(b(ii))[2]
Explain why LED lamps are better for the environment. Use information from Fig. 5.1 in your answer.