Radioactive decay and half-life are essential Physics 30 concepts for explaining nuclear changes, calculating radioactive activity, and evaluating how radiation is used safely. This Grade 12 Science worksheet combines nuclear notation, half-life calculations, nuclear equation balancing, and real-world isotope applications to help students connect nuclear theory with quantitative problem-solving.

The reading passage introduces unstable nuclei and the roles of protons and neutrons, then distinguishes alpha decay, beta-minus decay, and gamma radiation. Students examine how each process affects a nucleus, including changes to atomic number and nucleon number. The passage also explains why radioactive decay is random for individual nuclei but follows predictable statistical patterns across large samples.

Calculate, balance, and explain nuclear changes

Half-life practice asks students to determine how much radioactive material remains after successive half-lives and to calculate changes in activity over time. Problems use starting quantities, elapsed time, and half-life information, reinforcing the repeated-halving method and the relationship between activity and the number of undecayed nuclei.

Students also work with the conservation principles used to balance nuclear equations: total nucleon number and electric charge must be conserved. The reading connects nuclear reaction energy to mass differences and the relationship expressed by E = mc². Across multiple-choice questions, true-or-false statements, and short-answer explanations, learners distinguish radiation types, interpret half-life situations, and explain the reasoning behind balanced equations.

Application tasks extend the topic to medical uses of radioisotopes, oil well logging, environmental background radiation, and radiation safety. Students consider how shielding, distance, exposure time, and monitoring can reduce unnecessary exposure. A labeled diagram, categorization activity, and short note provide additional ways to organize and communicate ideas about nuclear physics.

What the resource includes

• Printable student worksheet with a focused reading passage and varied practice activities
• Half-life and activity calculations, nuclear notation concepts, and nuclear equation balancing practice
• Student Notes lines at the bottom of the worksheet
• Separate PDF answer key for checking responses
• Teacher Guide within the Answer Key PDF, with Learning Objectives, Teaching Tips, Discussion Questions, and Common Mistakes

Use in a Physics 30 classroom

Use this nuclear physics worksheet after introducing radioactive decay, as guided practice for half-life calculations, or as a review of nuclear equations and radiation safety. The reading passage can establish key vocabulary before students work independently, while the calculation and explanation tasks help teachers identify whether learners can apply the concepts rather than simply recall definitions. The answer key and teacher guidance also support lesson preparation and response review.

Alberta is the named framework for this resource; no specific curriculum outcome alignment is claimed. The combination of quantitative half-life problems, conservation reasoning, and evidence-based applications makes this worksheet useful for connecting nuclear processes with their scientific and practical significance.