Year 11 Physics booklet Topic 1 Atomic structure and radioactivity Name:
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1 Year 11 Physics booklet Topic 1 Atomic structure and radioactivity Name:
2 Atomic structure and radioactivity Give a definition for each of these key words: Atom Isotope Proton Neutron Electron Atomic nucleus Radioactivity Radioactive decay Ionising radiation Alpha Beta Gamma Half-life Background radiation Nuclear fission Nuclear fusion Chain reaction
3 Atomic structure Element Electrons Protons Neutrons and and 75
4 Timeline of atomic models Date 460BC Name John Dalton Niels Bohr Atomic sketch Discovery made An isotope is an atom of the same with a different number of. Examples are Carbon- which has 6 protons and 6 neutrons, and Carbon-14 which has protons and neutrons. Some isotopes are unstable because of the number of neutrons, so they can break down or. These isotopes are. There are 3 types of ionising radiation;, and gamma. Alpha particles have a mass of and a charge of Beta particles have a mass of and a charge of
5 α, β & γ Level Assessed Task Task: Design a poster to show the properties of the three types of ionising radiation, explaining the changes that occur to the nuclei of atoms when radioactive decay occurs. You should include diagrams to illustrate your answers. Key words: Alpha, beta, gamma, proton, neutron, electron, atomic number, mass number, penetrating power, ionising power, stability. Grade ladder: What is your target grade? Use the grade ladder to help you reach it: To get grade You might have: 4-5 Drawn a labelled diagram to show each type of ionising radiation. Identified the atomic and mass number of each type of ionising radiation. Stated which ionising radiation is the most penetrating. Stated and illustrated what material is required to stop each type of ionising radiation. Stated which ionising radiation is the most ionising. Stated how to detect ionising radiation. 6-7 Described the structure of an atom in terms of protons, neutrons and electrons and used symbols to describe particular nuclei. Explained what an isotope is, giving an example. Identified the charge of each type of ionising radiation. Constructed an example decay equation for each type of ionising radiation. Identified the changes to the nucleus of an atom during radioactive decay. 8-9 Explained the charge of each type of ionising radiation. Explained why some atoms are unstable. Explained the changes to the atomic number and mass number during radioactive decay. Used the size and charge of each type of ionising radiation to explain the link between ionising power and penetrating power. Described the changes to the nucleus of an atom during radioactive decay.
6 Half-Life 1 Look at the graph. It shows a theoretical decay curve for iodine-131. Follow these steps to calculate the half-life of iodine-131. i What is the activity of iodine-131 at the beginning? ii How long does it take for the activity to drop to a half of this value? iii What value does this give for the half-life of iodine- 131? Now you can check your result. i What is the activity of the iodine-131 at a time of 4 days? ii How long does it take for the activity to drop to a half of this value? iii What value does this give for the half-life of iodine- 131? Do your answers for the half-life agree?
7 Nuclear fission What is nuclear fission? Which radioactive isotopes do we use in nuclear reactors? Label the parts of the nuclear reactor: How does one nuclear fission reaction lead to a chain reaction of fission events? What are the safety issues with nuclear fission? What are the fuel rods? What are the control rods? Why is the reactor surrounded by a large concrete container? What does the coolant do? What do we use? What is a moderator? What do we use?
8 Nuclear fusion
u d Fig. 6.1 (i) Identify the anti-proton from the table of particles shown in Fig [1]
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1 (a) Fig. 6.1 shows the quark composition of some particles. proton neutron A B u u d u d d u d u u u u d Fig. 6.1 (i) Identify the anti-proton from the table of particles shown in Fig. 6.1. (ii) State
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