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As Potassium-40 decays, it becomes argon-40, as shown in the following graph.

Potassium-40 has a half-life of approximately 1.25 billion years. Approximately how many years will pass before a sample of potassium-40 contains one-fourth the original amount of parent isotope?
1.25 billion
2.5 billion
3.75 billion
5 billion

Answer :

joseaaronlara

Answer:

The answer to your question is  2.5 billion years

Explanation:

The initial amount of Potassium  There is                            X      

After 1,25 billion years                  There will be   [tex]\frac{X}{2}[/tex]  

After 1.25 billion years                   There will be [tex]\frac{X}{4}[/tex]

That means that the after 1.25 billion years + 125 billion years there will be one-fourth of the initial amount.

Total time = 2.5 billion years

Hom3workmachin3

Answer:

2.5 billion years

Explanation:

Using the chart I provided you can see that when the potassium is at 1/4, it is on the "2". Since each mark stands for 1.25 billion, and 2 x 1.25 is 2.5, the answer is 2.5

${teks-lihat-gambar} Hom3workmachin3

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