Question: (3) After 1010 years a radioactive substance has decayed so that four thirteenths of the original amount remains.(a) What is the half-life of this substance?(b)

(3) After 1010 years a radioactive substance has decayed so that four thirteenths of the original amount remains.(a) What is the half-life of this substance?(b) Given that after 1012 years the amount of substance remaining is 10 units determine the original amount.(c) How long will it take until only 380 of the initial amount remains?

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