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23 September, 18:22

What is a half-life

the reactive half of a radioactive substance

the amount of time it takes for all of a radioactive substance to decay

the amount of time it takes for half of a radioactive substancec to decay

half the time it takes for a radioactive substance to break down

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  1. 23 September, 18:49
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    Third choice

    "the amount of time it takes for half of a radioactive substancec to decay"
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