SOLUTION: b) HoHalf life of silicon 32 is 710 years. If a sample has 100 grams right now: a) How much will be present in 600 years? w much was present in 1809?
Question 185467: b) HoHalf life of silicon 32 is 710 years. If a sample has 100 grams right now: a) How much will be present in 600 years? w much was present in 1809? Answer by ankor@dixie-net.com(22740) (Show Source):
You can put this solution on YOUR website! Half life of silicon 32 is 710 years. If a sample has 100 grams right now:
a) How much will be present in 600 years?
;
The half life equation: A = Ao*2^(-t/h)
Where
A = Resulting amt after t years
Ao = initial amt (t=0)
t = time in years
h = half life of substance in years
;
A = 100* 2^(-600/710)
Find 2^(-60/71) on a calc
A = 100 * .55668
A = 55.67 grms after 600 yrs
:
b) How much was present in 1809:
that would be 2009 - 1809 = 200 years ago; we want to Find Ao 200 yrs ago
:
100 = Ao* 2^(-200/710)
Find 2^(-20/71) on a calc
100 = .8226*Ao
Ao = 100/.8226
Ao = 121.56 grms were present 200 yrs ago
