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Derive the Relation Between the Decay Constant and Half Life of a Radioactive Substance. a Radioactive Element Reduces to 25% of Its Initial Mass in 1000 Years. Find Its Half Life.

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Question

(a) Derive the relation between the decay constant and half life of a radioactive substance. 
(b) A radioactive element reduces to 25% of its initial mass in 1000 years. Find its half life.

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2016-2017 (March) Foreign Set 3
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