The isotope of a certain element has a half life of 22 years. What percentage of a pure element sample prepare in may 2002, would have decayed by May 2009?
The answer it gives is 42%, but I'm not sure that's right because when I solve it, I get 80%.
Thanks for the help.
The answer it gives is 42%, but I'm not sure that's right because when I solve it, I get 80%.
Thanks for the help.
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7 years/22 years = 0.3182 (this is how many half-lives have elapsed)
(1/2)^0.3182 = 0.802 (this is the decimal amount _remaining_)
If 0.802 remains, then 0.198 has decayed.
Not sure where the 42% comes into play.
(1/2)^0.3182 = 0.802 (this is the decimal amount _remaining_)
If 0.802 remains, then 0.198 has decayed.
Not sure where the 42% comes into play.