OCR A level Physics: Chapter 25 Radioactivity is apart of the Module 6: Particle and Medical Physics All presentations come with worked examples, solutions and homeworks. 25.1 Radioactivity 25.2 Nuclear decay equations 25.3 Half-life and Activity 25.4 Radioactive Decay Calculations 25.5 Modelling Radioactive Decay 25.6 Radioactive Dating Types of ionising radiation (alpha, beta-plus/beta-minus, gamma) Penetration power and ionising power Detecting radiation with a Geiger (GM tube) counter Background radiation and correct count rates Electric and magnetic fields affect ionising radiation Cloud chambers Typical speeds of radiation produced form nuclear decays Conservation rules for nuclear decays Nuclear notation Alpha decays Beta-minus and beat-plus decays Gamma decays Decay chains The reason why radioactive decays are considered random and spontaneous Rolling dice being a good analogue for radioactive decays Definition of half-life Determining half-life from a graph. Calculating half-life from a table of data. Activity of a sample in Bq The decay constant derivation Decay constant and half-life Using exponentials to calculate activity and number of nuclei present Solving Differential Equations (beyond A-level Physics course) Iterative Method Selecting appropriate time intervals Comparing answers from the iterative method and exact solution. State what isotopes of carbon are used in carbon dating. Explain how carbon dating works. Calculate the age of objects with carbon dating.

OCR A level Physics: Chapter 26 Nuclear Physics is apart of the Module 6: Particle and Medical Physics All presentations come with worked examples, solutions and homeworks. 26.1 Einstein’s Mass-Energy Equation 26.2 Binding Energy 26.3 Nuclear Fission 26.4 Nuclear Fusion Mass-energy is a conserved quantity Einstein’s mass-energy equation Particle and antiparticle annihilate each other Rest mass and increasing mass with increased kinetic energy Interpretation of mass-energy equivalence Definition of mass defect Definition of binding energy Binding energy per nucleon Calculating mass defect, binding energy, and binding energy per nucleon. Explaining nuclear stability Fuels in nuclear fission reactors Moderators and thermal neutrons Conservation of mass-energy Energy released in fission reactions Control rods Nuclear waste management Conditions for nuclear fusion Binding energy and released energy

All resources for B1.1 Cell Structures GCSE OCR Biology Gateway 9-1. Triple and combined (Higher and Foundation) is covered in this material. Each PowerPoint is a whole lessons included with student activities and animated answers. Cells are the building blocks of living objects. Definition of eukaryotic cells Typical size of eukaryotic cells Subcellular structure of animal cells Subcellular structure of plant cells Organelles and their functions Revision activities (Look, Cover, Write, Check) Print out of animal and plant cells Typical size of bacterial cells Subcellular structure of bacterial cells Functions of subcellular structure of bacterial cells Comparing animal, plant, and bacterial cells Revision activity - flash cards Print out of bacterial cell Labeling a light microscope Defining magnification and resolution. Explaining why stains are used for light microscope. Calculating total magnification, objective lens magnification and eyepiece lens magnification. Calculating actual size, magnification, and magnified size of objects. Converting from from micrometre (µm) to millimetres (mm) Rearranging equations Comparing sizes of different cells Using standard form Using SI prefixes (nano, micro, milli, kilo, mega) Comparing electron microscopes and light microscopes.

All resources for B1.2 What happens in cells? GCSE OCR Biology Gateway 9-1. Triple and combined (Higher and Foundation) is covered in this material. Each PowerPoint is a whole lessons included with student activities and animated answers. DNA stands for deoxyribonucleic acid. DNA is found in the nucleus of cells. DNA is packaged into a thread-like structure called chromosomes. Humans typically have 46 chromosomes shared from their parents. Genes are sections of DNA that code for physical characteristics. The structure of DNA. DNA is comprised of monomers called nucleotides. A nucleotide consists of a phosphate group, a sugar (deoxyribose), and an organic base. There are four organic bases: Adenine, A. Thymine, T. Cytosine, C. Guanine, G. Hydrogen bonds in DNA. The role of proteins and AI Proteins as polymers Explaining transcription mRNA and complementary bases Explaining translation Enzymes are made of protein. Enzymes are biological catalysts. Catalysts speed up the rate of reaction without being used up themselves. Enzymes and the lock and key hypothesis. Enzymes breaking down and bonding substrates. Enzymes-catalysed reactions Rate of reaction Denaturing of enzymes and the active site Optimum temperature and optimum pH for enzymes Definition of concentration Increasing concentration of enzymes and substrates Saturation of substrates