Asked by Jay

How much time in years (assume a 365 day yr) would it take for a 1.6678g sample of 239Np to decay to a mass of 0.8671g if it has a half life of 2.030*10^5s
Answered by DrBob222
k = 0.693/t<sub>1/2</sub>
Substitute k into the equation below.

ln(No/N) = kt
No = 1.6878
N = 0.8671
k fro above.
Solve for t (in seconds) and change to years.
Answered by Jude
Thank you so much DrBob222
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