If a sample of a radioactive isotope has ahalf-life of three years, how much of

Question

       If a sample of a radioactive isotope has ahalf-life of three years, how much of the original sample will beleft at the end of 3-years 6-years 7 years 9-years
Pleasae walk me through the formula and explain what you aredoing when doing this problem.        If a sample of a radioactive isotope has ahalf-life of three years, how much of the original sample will beleft at the end of 3-years 6-years 7 years 9-years
Pleasae walk me through the formula and explain what you aredoing when doing this problem.

Explanation / Answer

decaying equation N(t)=No*2^(-t/T) where T= 3 years when t=3 years =>N(T)/No=0.5 t= 6 =>N(t)=No*2^(-6/3)=No/4 =>N(t)/No=0.25 t=7 => N(t)=No*2^(-7/3)=No*0.198 =>N(t)/No=0.198 t=7 => N(t)=No*2^(-7/3)=No*0.198 =>N(t)/No=0.198 t=9 =>N(t)=No/8=> N(t)/No=0.125 t=12 =>N(t)=No/16=> N(t) /No=0.0625

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