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In this video, we look at what is meant by the half-life of a radioactive isotope. We then look at how to determine the half-life and how to calculate the count-rate after a given number of half-lives.

This video is based on the AQA spec. If you are following a different exam board then you should check your specification. The Amazon link above is an affiliate link. This provides a small commission which helps to support freesciencelessons. The cost remains the same to you. If you prefer not to use this, you can search Amazon for the Freesciencelessons workbooks.

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