earth science

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if carbon 14 has a half life of 24 days how much would be left of 220 gram sample after 168 days

• earth science -

x = Xi e^-kt

1/2 = e^-24 k

ln .5 = -24 k

-.693 = -24 k
k = .0289

so
x = 220 e^-.0289*168
= 220 * .00779
= 1.71 grams

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