In the field of nuclear physics, half-life refers to the amount of time required for radioactive substances to decay into half. In this lesson, we will work on word questions about exponential decay of radioactive substances.
Af: final amount Ai: initial amount f : growth/decay factor half-time→f=21 triple→f=3 ten-fold→f=10 increase by 10%→f=(1+10010)=1.1 decrease by 8%→f=(1−1008)=0.92 time : total time given period : every length of time
Strontium-90 is a radioactive substance with a half-life of 28 days. How many days will it take for a 200 gram sample of strontium-90 to be reduced to 8 grams?