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OpenStudy (anonymous):
the mass remaining after t days from a 40 g sample of thorium -234 is given by the formula f(t)=40e^-0.0277t what is the half life of thorium-234?
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OpenStudy (anonymous):
ohhhhhh. I love half-life problems.
OpenStudy (anonymous):
so you are given the decay constant
OpenStudy (anonymous):
half-life = ln(2) / decay constant
OpenStudy (anonymous):
decay constant here is = -0.0277
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