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anonymous
 5 years ago
A radioactive isotope has a half life of 700 years. If there is currently 6 mg of the isotope then how much was there 350
years ago?
A) 7.74 mg
B) 8.49 mg
C) 9.24 mg
D) 9.99 mg
E) 10.74 mg
anonymous
 5 years ago
A radioactive isotope has a half life of 700 years. If there is currently 6 mg of the isotope then how much was there 350 years ago? A) 7.74 mg B) 8.49 mg C) 9.24 mg D) 9.99 mg E) 10.74 mg

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Yuki
 5 years ago
Best ResponseYou've already chosen the best response.1hey, still having trouble with decays ?

Yuki
 5 years ago
Best ResponseYou've already chosen the best response.1half life problems are the same as the other exponential decay problems , it only focuses on how long it takes so that the size of the object is half.

Yuki
 5 years ago
Best ResponseYou've already chosen the best response.1so instead of just \[N_t = N_0(R)^{t}\] you can now use \[N_t = N_0(1/2)^{t/h}\]

Yuki
 5 years ago
Best ResponseYou've already chosen the best response.1so in your problem, the initial amount is what we are looking for and N_t is 6 mg while h =700. \[6 = N_0(1/2)^{350/700}\] t = 350 because 350 years later, the amount is 6mg. in other words, now it is 6mg and we want to know how much it was 350 years ago

Yuki
 5 years ago
Best ResponseYou've already chosen the best response.1so N_0 is approximately 8.49

Yuki
 5 years ago
Best ResponseYou've already chosen the best response.1I need to go, so just remember the eqn I taught you, ok? good luck :)
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