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OpenStudy (anonymous):
The radioactive substance krypton-91 has a very short half-life of about 10 seconds. What is the decay constant for this substance?
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OpenStudy (kainui):
\[\frac{ \ln2 }{ t _{1/2} }=k\] I can derive this for you if you'd like.
OpenStudy (anonymous):
half life= 0.693/decay constant
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