Shanghai Singapore International School Subject area: Physics Topic: General physic Unit title: Atomic Physics Time allocation: 7 Weeks Year Group: Grade 10 Trimester: Trimester 2 Aims: 1. To identify the definitions of the following terms: a. Nucleon b. Nuclide c. Isotope 2. To explain scientists' ideas about the structure of the atom over the last century. 3. To communicate the progression of ideas about the structure of the atom through words and diagrams. 4. To distinguish between the different types of radioactive decays and compute the daughter nuclei for these decays. 5. To use the concept of half life to determine the age of a radioactive sample 6. To distinguish safety precaution when handling radioactive materials Pre-requisite knowledge: 1. Students are required to handle basic algebraic. 2. Students are aware of that an atom is composed of protons, nuetrons and electrons. 3. Students are aware of the dangers of radiation from radioactive materials Learning objectives Teaching Notes/ Essential Questions Assessment / Assignment Resources 5. Atomic physics 5.1 Radioactivity (a) Detection of radioactivity Core • Show awareness of the existence of background radiation • Describe the detection of α-particles, β-particles and γ-rays (β+ are not included: βparticles will be taken to refer to β–) (b) Characteristics of the three kinds of emission Core • State that radioactive emissions occur randomly over space and time • State, for radioactive emissions: – their nature – their relative ionising effects – their relative penetrating abilities Supplement • Describe their deflection in electric fields and magnetic fields • Interpret their relative ionising effects (c) Radioactive decay Core • State the meaning of radioactive decay, using equations (involving words or symbols) to represent changes in the composition of the nucleus when particles are emitted (d) Half-life Core • Use the term half-life in simple calculations, which might involve information in tables or decay curves (e) Safety precautions Core • Describe how radioactive materials are handled, used and stored in a safe way Various video resources and worksheet What does it mean by activity? What will happen if there are too many positively charged particles tangled up together? Assignment: Worksheets on radioactivity. Demo lab using Phet simulation; Alpha decay Beta decay Nuclear fission What happen if charged particles passing through a magnetic field? Assignment: Dice experiment on half life What do we do with the nuclear waste? 5.2 Nuclear atom (a) Atomic model Core • Describe the structure of an atom in terms of a nucleus and electrons Identify and explain some Supplement • Describe how the scattering of α-particles by thin metal foils provides evidence for the nuclear atom (b) Nucleus Core • Describe the composition of the nucleus in terms of protons and neutrons • Use the term proton number Z • Use the term nucleon number A • Use the term nuclide and use the nuclide notation ZA X (c) Isotopes Supplement • Use the term isotope • Give and explain examples of practical applications of isotopes What's the meaning of an Atom? What is an atom made of? How do we know that an atom is composed of a neucleus and electrons? Worksheets on questions about atomic structure. Assignment: Mini Virtual lab using phet: Rutherford scattering simulation Have you heard of plum pudding model? What is the size of electrons comparing to a proton? Is there an element that has the same atomic number but different mass numbers? Test: Atomic Physics