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OpenStudy (anonymous):
How long will it take for a radioactive isotope with a decay constant of 0.15 (which means a half life of 4.6 days ) to decay to 5% of its original value? (At = A0e^-kt) A 3 days B 4.6 days C 5 days D 10.73 days E 19.97 days
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OpenStudy (sidsiddhartha):
log(20)=kt t=2.3026*log(20)*4.6/0.693=19.9
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