elgallo5399
04.05.2020 •
Mathematics
Element X is a radioactive isotope such that every 21 years, its mass decreases by half. Given that the initial mass of a sample of Element X is 40 grams , how much of the element would remain after 9 years , to the nearest whole number?
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Ответ:
30 grams
Step-by-step explanation:
Use the half life equation:
A = P (½)^(t / T)
where P is the initial amount, t is time, and T is the half life length.
Given P = 40, t = 9, and T = 21:
A = 40 (½)^(9 / 21)
A ≈ 30
Ответ:
90 and 145
Step-by-step explanation: