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Cobalt-60 has half-life of about 5 years. After 20 years, how many grams of a 2,076 gram sample will remain? Round to the hundredth place if answer doesn’t have a tenths use a zero so the answer does.

Sagot :

Givn the following question:

Half-life is equal to 5 years

Every 5 years its life gets halved.

Find the amount after 20 years

[tex]\begin{gathered} 2076\div\frac{1}{2}=1038=5\text{ years} \\ 1038\div\frac{1}{2}=519=10 \\ 519\div\frac{1}{2}=259.5=15 \\ 259.5\div\frac{1}{2}=129.75=20 \\ 129.75=20\text{ years} \end{gathered}[/tex]

129.75 is your answer.

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