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How much of a 400-gram sample of K40 is left after 2 half-lives?
Wiki User
∙ 14y ago
After the first half-life, you will have one half of the starting amount. After a second half-life period, you'll be down to one quarter.
Of the part that radioactively decays, about 11% of it will decay to 40Ar, and the remainder to 40Ca.
Of your total sample of ordinary potassium, only 0.012% will be 40K. The half-life of 40K is about 1.3x109 years.
Wiki User
∙ 12y ago
After 2 half-lives, 25% of the initial amount of K40 would remain in the sample. This means 100 grams of K40 would be left after 2 half-lives.
Wiki User
∙ 14y agoA 400 gram sample of any radioactive nuclide would decay to 100 grams after 2 half-lives.
AT = A0 2(-T/H)
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