All isotopes of technetium are radioactive, but they have widely varying half-lives. If an 800.0 g sample of technetium-99 decay
s to 100.0 g of technetium-99 in 639 000 y. What is it's half-life?
1 answer:
The formula for A = Ao (1/2) ^ t/h
So sub in.
100 = 800 (1/2) ^ 639,000/?
That's all i can do lol
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Well not getting any of the answers :/ i get 1184
Substitute the x with 5
-(5)2 + 4(5) - 10 = 0