![]() LEGO and M&Ms can be used to model this random decay while also negating the need for students to handle radioactive materials. Half-life is random and it is impossible to know which individual parent nucleus will be the next to decay. ![]() The half-life of a radioactive substance is the time it takes for the number of parent nuclei in a sample to halve, or for the count rate from the original substance to fall to half its initial level.
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