We are asked to determine the half-life of the radioactive isotope which has a rate starting from 2000 min-1 to 250 min-1 after 120 hrs
The integrated rate law for a 1st-order reaction is as follows:
where rate= rate at time t, k = rate constant, t = time, initial rate = starting rate
A sample containing a radioactive isotope produces 2000 counts per minute in a Geiger counter. After 120 hours, the sample produces 250 counts per minute. What is the half-life of the isotope?
A. 60 h
B. 15 h
C. 20 h
D. 30 h
E. 40 h
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