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Half-life question???

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A radioactive sample has an activity of 2000 Bq at one moment in time and 125 Bq a period of 2 years later. What is the half-life of the sample?

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  1. Half a year.

    After 0.5 years, it will be 1000

    After 1 year it will be 500

    After 1.5 years it will be 250

    After 2 years it will be 125

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