Lesson presentation. IB physics first exams 2025, syllabus section E3 in pdf, ppt & odp format. 107 slides. Mass defect, equivalence of mass & energy, the strong nuclear force, types of radioactive decay, penetration & ionizing properties of ionizing radiation, half-life, background radiation, binding energy, discrete nuclear energy levels, the decay law. Emphasis on graphics with clear, bespoke figures. Step-by-step worked examples. Includes a short quiz at the end modeled on past paper multip