4.4.2.3

4.4.2.3 Half-lives and the random nature of radioactive decay

4.4.2.3 Half-lives and the random nature of radioactive decay

Content

Radioactive decay is random.

The half-life of a radioactive isotope is the time it takes for the number of nuclei of the isotope in a sample to halve, or the time it takes for the count rate (or activity) from a sample containing the isotope to fall to half its initial level.

Students should be able to explain the concept of half-life and how it is related to the random nature of radioactive decay.

Students should be able to determine the half-life of a radioactive isotope from given information.

(HT only) Students should be able to calculate the net decline, expressed as a ratio, in a radioactive emission after a given number of half-lives.


WS 1.2 Use a variety of models such as representational, spatial, descriptive, computational and mathematical to solve problems, make predictions and to develop scientific explanations and understanding of familiar and unfamiliar facts.


MS 4a -Translate information between graphical and numeric form


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Halflife

Foundation

Halflife Ans

Foundation

Halflife

Higher

Halflife Ans

Higher