An engaging, practical-based lesson presentation (34 slides), accompanied by a practical worksheet and differentiated questions worksheet, which together guide students through the different calculation questions which involve the half-life. The lesson begins by introducing the students to the definition of a half-life and then showing them an example with I-131 so they can visualise how the half-life doesn’t change (and that radioactivity is measured in Bq). Moving forwards, the students will follow the given instructions to create the results to plot a decay curve and will be shown how to use this curve to determine the half-life of an isotope. The remainder of the lesson focuses on the different calculation questions that can be found on exam papers and uses a step by step guide to help them to handle the increasing difficulty. Students will be challenged to apply their new found knowledge to a set of 5 questions and this worksheet has been differentiated two ways so that those who need extra assistance, can still access the learning. Progress checks have been written into the lesson at regular intervals so that students can constantly assess their understanding.
This lesson has been designed for GCSE students (14 - 16 years old in the UK)
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