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r-ruslan [8.4K]
3 years ago
12

Answer options : 120, 60, 180 or 90

Mathematics
1 answer:
DochEvi [55]3 years ago
5 0
180 I believe - sorry if it’s wrong :(
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Step-by-step explanation:

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8 0
3 years ago
The radioactive isotope of lead, Pb-209, decays at a rate proportional to the amount present at time t and has a half-life of 3.
Ksenya-84 [330]

Answer:

5.73 hours

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70% decay means 30% remains

.3 = (1/2)^(t/3.3)

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multiply both sides by 3.3

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rounded

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5 0
3 years ago
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