Fe -59 has a half life of 45.1 days. How old is an iron nail if the Fe-59 content is 25% that of a new sample of iron? Please show all calculation.

Question

arihangdu · Answer

Will medal and fan as soon as possible.

cuanchi · Answer

One half life is the time that takes to decrease the amount of the nucleoide in half of the original amount.
That means that in 45.1 days (one half life) you will have 50% of the original amount of Fe-59 compared with the new sample of iron

In two half life (45.1 days x 2) you will have 50% of the 50%, that means 25% of the new sample contents.

What do you think is the answer?

arihangdu · Answer

25%=25/100 =1/4.
(1/2)n=1/4.so, n=2 half lives.
45.1 days x 2 half lives=90.2 days .  Right?

arihangdu · Answer

Is this correct? My friends. I'm not sure.

arihangdu · Answer

Please help me to check my answer

cuanchi · Answer

Yes that is Perfect of a Master!!!!

arihangdu · Answer

Hank you my friend.