science
posted by chuck .
The halflife of carbon 14 is 5730 years. if a 1 g sample of old carbon is 1/8 as radioactive as 1 g of a current sample, then the age of the old sample is about ___________years.
22,900
17,200
11,500
716

science 
running.from.myself
if I am correct, B. 17,200. I looked it up and this is what it said "b.) 17,200
if it takes 5730 years to be half then it takes 2*5730 years to be a quarter and 3*5730 years to be an eighth (2^3=8) so to get an 1/8 you need to half it 3 times and it takes 5730 years to half each time, thus 3*5730 ~ 17,200" 
science 
Frank
Thanks

science 
running.from.myself
No problem.
Respond to this Question
Similar Questions

calculus
Carbon14 is a radioactive substance produced in the Earth's atmosphere and then absorbed by plants and animals on the surface of the earth. It has a halflife (the time it takes for half the amount of a sample to decay) of approximately … 
college physics part 2
the activity of a sample of carbon has oneeighth of the initial activity. carbon14 has a halflife of 5730 yr. how old is the sample in yr? 
halflife
ok so i got... the half life of carbon14 is 5730 years, the relation c+(1/2)^ N/5730 is used to calc. the concentration, c, in parts per trillion remaining n years after death determine the carbon concentration in a 11460 year old … 
halflife
ok so i got... the half life of carbon14 is 5730 years, the relation c+(1/2)^ N/5730 is used to calc. the concentration, c, in parts per trillion remaining n years after death determine the carbon concentration in a 11460 year old … 
chemistry
A 1.00g sample of carbon from a modern source gave 15.3 disintegrations per minute. A sample of carbon from an “old” source gave 920 disintegrations per hour. What is the age of the “old” sample of carbon? 
chemistry
A 1.00g sample of carbon from a modern source gave 15.3 disintegrations per minute. A sample of carbon from an “old” source gave 920 disintegrations per hour. What is the age of the “old” sample of carbon? 
ChemB
The activity of carbon 14 in living tissue is 15.3 disintegrations per minute per gram of carbon. The limit for reliable determination of age is based on carbon 14 is .10 disintegration per min per gram of carbon. Calculate the max … 
physical science
a scientist found a fossilized bison. using Carbon14 dating, she found that the fossil was about 45,840 years old. Carbon14 has a halflife of 5730 years. how many halflives have passed? 
Radioactivity
1. A granite rock is thought to be about 2 billion years old. why is it not possible to determine the age of the Rock using carbon14 dating? 
physics
The halflife of carbon14 is 5730 years. How much of a 50 g sample of carbon14 is present after 11,460 years?