A sample of 1.2×10^10 atoms that decay by alpha emission has a half-life of 90 min. How many alpha particles are emitted between t=50 min and t=200 min? Express your answer using two significant figures.
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693 / T1/2, where T1/2 is the half-life of the atoms. Given T1/2 = 90 min, λ = 0.693 / 90 λ ≈ 0.0077 min^-1 Show more…
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