Question

How much of a radioactive kind of ruthenium will be left after 8 hours if you start with 3,888

grams and the half-life is 4 hours?
grams
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Answer 1

After 8 hours or 2 half-lives, you will have 972 grams of ruthenium left.

Explanation:

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Answer 2

Explanation:

As an example, iodine-131 is a radioisotope with a half-life of 8 days. It decays by beta particle emission into xenon-131. After eight days have passed, half of the atoms of any sample of iodine-131 will have decayed, and the sample will now be 50% iodine-131 and 50% xenon-131.

50 grams to 25 grams is one half-life. 25 grams to 12.5 grams is another half-life. So, for 50 grams to decay to 12.5 grams, two half-lives, which would take 36 days total, would need to pass. This means each half-life for element X is 18 days.