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20 August, 15:30

The half-life of a radioactive kind of

cesium is 30 years. How much will be

left after 60 years, if you start with

1,800 grams of it?

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Answers (2)
  1. 20 August, 15:41
    0
    Every 30 years you'll have half left

    After 30 years = 900 grams

    after 60 years 450 grams
  2. 20 August, 15:45
    0
    450 gm ... this is because we start with 1800/2 = 900 = 30 and 900/2 = 450 = 60 yrs. = 450 gm
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