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Sodium-24 is used to study blood circulation and has a half-life of 15 hours. Which one...

Sodium-24 is used to study blood circulation and has a half-life of 15 hours. Which one of the following statements is true?

a.

It is not possible to know exactly how much remains after 45 hours because the rate of decay depends on the initial amount.

b.

After 45 hours have elapsed, all of the nuclide will have decayed.

c.

After 45 hours have elapsed, 1/8 of the original amount remains

d.

After 45 hours have elapsed, 1/4 of the original amount remains.

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