1. C3 –Radioactive materials

2. Question 1 Complete the Sankey diagram and then calculate the efficiency of this coal fired power station? Cooling steam y MJ Electricity x MJ Exhaust gases 400 MJ Coal 2000 MJ

3. Question 2 Which is the odd one out? Explain why? A.Coal B.Electricity C.Gas D.Oil

4. Question 3 Which is the odd one out? Explain why? A.Solar B.Wind C.Nuclear D.Coal

5. Question 4 Radon-22 has a half-life of one minute, sketch a graph to show its half-life and explain what the term half-life means.

6. Question 5 Which of the following isotopes would be the best to use as a tracer in humans? IsotopeHalf-lifeRadiation emitted A2 yearsGamma B40 minutesAlpha C20 minutesBeta D2 hoursGamma

7. Question 6 Which of the following isotopes would it be best to use in a pill to treat thyroid cancer? IsotopeHalf-lifeRadiation emitted A2 yearsBeta B4 yearsGamma C20 minutesAlpha D2 hoursBeta

8. Question 7 Which of the following statements is correct? A.Electrons are found in the nucleus. B.Protons are negatively charged. C.All atoms of Carbon have same number of protons. D.Radioactive decay can be slowed down by cooling the radioactive source.

9. Question 8 Which of the following is the most important source of background radiation in the UK? A.Food and drink B.Radon gas C.Cosmic rays D.Waste from nuclear power stationsMonoxide

10. Question 9 Which statement is False? A.A few cm of air stops alpha radiation B.A layer of dead skin stops alpha radiation C.A few cm of aluminium stops gamma radiation D.A few metres of concrete stops gamma radiation

11. Question 10 Which of the following would not result in radioactive contamination? A.Breathing in radon gas B.Being injected with technetium-99m to trace kidney damage C.Sterilising surgical equipment with a gamma emitter. D.Treating thyroid cancer with Iodine-131

12. Question 11 Which of the following is the correct block diagram for a nuclear power? A.Furnace  Boiler  Turbine  Generator  Transformer B.Furnace  Boiler  Generator  Turbine  Transformer C.Reactor  Heat exchanger  Generator  Turbine  Transformer D.Reactor  Heat exchanger  Turbine  Generator  Transformer

13. Question 12 Spot the mistakes Intermediate level waste has to be stored under water. This is because it is made up of spent fuel rods that are highly radioactive.

14. Question 13 Spot the mistake Nuclear fusion is when a neutron splits a uranium nucleus into two smaller nuclei and releases more neutrons, gamma rays and thermal energy.

15. Question 14 Spot the mistake The control rods in a nuclear power station are used to absorb protons and hence speed up or slow down the rate of nuclear fission.

16. Question 15 Spot the mistake Coal is a better means of producing electricity than natural gas because it produces less carbon dioxide.