A radioactive sample has a decay constant of 49.15x10-12 s¹. Estimate the half-life.
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A: T1/2 = 1620 years = 1620 x 3.15 x 107s λ = 0.693/ T1/2 = 0.693/(1620 x 3.15 x 107 s)
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Q: What is the mass of 1ci of 227Th? If the half-life is 1.90 years.
A: T1/2 = 1.90 years = 1.90 x 3.15 x 107 s λ = 0.693/T1/2 = 0.693/(1.90 x 3.15 x107s)
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