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Asked by Prashant DIGHE | 11 Jan, 2020, 09:46: PM
Expert Answer
Fraction f of undecayed mass of radioactive element after time t is given by
f = e-λt .....................(1)
where λ is decay constant
if we need to get the fraction of undecayed mass after 2 mean-life, then time t = 2/λ
Hence eqn.(1) becomes, f = e-2 ≈ 0.135
Hence mass of undecayed element = (10×0.135) g = 1.35 g
Answered by Thiyagarajan K | 11 Jan, 2020, 10:58: PM
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