SOLUTION: The half-life of radium is approximately 1600 years. If the present amount of radium in a certain location is 700 grams, how much will remain after 1200 years? Express your answer

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Question 1025890: The half-life of radium is approximately 1600 years. If the present amount of radium in a certain location is 700 grams, how much will remain after 1200 years? Express your answer to the nearest gram
Please help me get an answer, Thank you
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
The half-life of radium is approximately 1600 years.
If the present amount of radium in a certain location is 700 grams, how much will remain after 1200 years?
Express your answer to the nearest gram
:
the formula we will use here: A = Ao*2(-t/h), where
A = remaining amt after t time
Ao = initial amt
h = half-life of substance
t = time of decay
In this problem
A = 700*2(-1200/1600)
reduce the fraction
A = 700*2(-3/4)
using a calc
A = 700 * .5946
A = 416 grams