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0 9 Uranium-235 is used as a fuel in nuclear power stations. 09 1 Atoms of uranium-235 can be represented by the symbol in Figure 14. Figure 14 235 U 92 Determine the number of protons and the number of neutrons in the nucleus of a uranium-235 atom. [2 marks] Number of protons Number of neutrons
09 09 2 The nuclei of uranium are split by a process called nuclear fission in a nuclear reactor. Figure 15 shows the fission of a single uranium-235 nucleus. Figure 15 Xe- 140 U-235 Sr-94 The particles labelled A in Figure 15 are neutrons. The neutrons released in nuclear fission go on to cause fission of other uranium-235 nuclei. Give the name of this process. 3 To keep the rate of fission constant, some of the neutrons released need to be absorbed. Give the name of the part of a nuclear reactor that absorbs neutrons. [1 mark] [1 mark]
0 9 09 4 On one day, the average power output of a nuclear power station is 650 000 KW. The efficiency of the nuclear power station is 0.25 Calculate the average power input to the power station on that day. Give your answer in kW. Use the Physics Equations Sheet. [3 marks] Average power input = kW 5 A typical house needs 25 kWh of energy transferred by electricity in an 8-hour period during the day. Calculate the average power transferred to the house. Give your answer in kW. [3 marks] Power = kW
0 9 09 6 The average power output of the nuclear power station is 650 000 kW. Determine the number of typical houses that the nuclear power station can supply with electricity on an average day. Use your answer to Question 10.5. [1 mark] Number of houses = 7 Explain one advantage of using fission of uranium-235 in power stations rather than burning coal. [2 marks]