Asked by Andrea

How much time would it take for 9000 atoms of nobellium-253 (half-life is 97 s) to decay to 2250 atoms?
a)291 s

b)97 s

c)48.5 s

d)194 s
Please help ASAP!!! :(
Answered by Andrea
My bad it's actually a Science question :D
Answered by R_scott
(1/2)^n = 2250 / 9000 = 1/4

n = 2

2 half-lives
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