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β 13y agoThe half-life of 27Co60 is about 5.27 years. 15.8 years is 3 half-lives, so 0.53 or 0.125 of the original sample of 16 g will remain, that being 2 g.
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β 13y agoAfter 15.8 years, half of the original sample of 60Co would have decayed. This means that 8 grams of the original 16 gram sample will remain unchanged after that time period.
5g would remain
I suppose that you think to the radioactive isotope Cs-17; After 4 years remain 9,122 g.
This time is 17 190 years.
2 1/2 g
2 1/2 g
In theory, they can remain unchanged for their entire existence. However, in practise, nature isn't so nice and evolution happens eventually.
Approximately 400 grams of the potassium-40 sample will remain after 3.91 years, as potassium-40 has a half-life of around 1.25 billion years. This means that half of the initial sample would have decayed by that time.
5g would remain
The answer depends on 3240 WHAT: seconds, days, years?
I suppose that you think to the radioactive isotope Cs-17; After 4 years remain 9,122 g.
This time is 17 190 years.
25/100 = 1/4 of the original sample. The "half-life" must pass twice, yielding (1/2) x (1/2) = 1/4 of the original sample. The half-life of Carbon-14 is listed as ( 5,730 ± 40 ) years. Twice that is ( 11,460 ± 80 ) years
The president can remain in office for 2 four year terms . A total of eight years maximum
In warm wet conditions leather will decompose in several years. In dry conditions leather will remain unchanged for hundreds of years.
After 100 years, half of the original sample (20 grams) will remain. After another 100 years (total 200 years), only half of that amount (10 grams) will remain.
After 6 years, approximately 5 grams of cesium-137 would remain from a 10 g sample due to its half-life of around 30 years. This decay is exponential, with about half of the original sample decaying every 30 years.
2 1/2 g