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Sagot :
Answer:
N = N0 e^-λ t basic equation for radioactive decay
N / N0 = e^-λ t
ln N / N0 = ln 3.3 / 8.0 = - 20.9 λ
λ = .886 / 20.9 = .0424
T(1/2) = .693 / .0424 = 16.4 yrs half life
Check 20.9 / 16.4 = 1.27 half lives
2^1.27 = 2.41 will decay to 1 / 2.41 in 20.9 yrs
3.3 * 2.41 = 7.95
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