Nuclear Fission


(a) When a nucleus of uranium-235 fissions into barium-141 and krypton-92, the change in mass is 3.1 × 10–28 kg.

Calculate how many nuclei must undergo fission in order to release 1.0 J of energy by this reaction.

(2 marks)

(b) A nuclear power station produces an electrical output power of 600 MW. If the overall efficiency of the station is 35%, calculate the decrease in the mass of the fuel rods, because of the release of energy, during one week of continuous operation.

(4 marks)

(Total 6 marks)