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30 December, 18:46

2.5 gram sample of a radioactive element was formed in a 1960 explosion of an atomic bomb at Johnson Island in the Pacific Test Site. The half-life of the radioactive element is 28 years. How much of this element will remain after 112 years

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  1. 30 December, 20:36
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    0.15625 grams

    Explanation:

    Half life: It is related to the decay of radioactive material. The duration in which half of the material will be degraded/decayed. That means after half life 50% of the radioactive material will be left. Here the half life is 28 years.

    Initial quantity of the sample: 2.5 grams.

    After 28 years, the leftover quantity = 1.25 grams

    After 56 years, the leftover quantity = 0.625 grams

    After 84 Years, the leftover quantity = 0.3125 grams

    After 112 years, the leftover quantity = 0.15625 grams
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