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Sagot :
By the half-life of radioactive, the remaining mass of radioactive elements is 2.47 pounds.
We need to know about the half-life of the radioactive elements to solve this problem. The radioactive element will decay over time and follow the equation
N = No(1/2)^(t/t'')
where N is the final quantity, No is the initial quantity, λ is the decaying constant, t is time and t'' is the half-life of a radioactive element.
From the question above, we know that
t'' = 9 years
No = 6 pounds
t = 11.5 years
Calculate the remaining mass
N = No(1/2)^(t/t'')
N = 6(1/2)^(11.5/9)
N = 2.47 pounds
Find more on half-life at: https://brainly.com/question/25750315
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