If a sample of wood is carbon dated and two half-lives have passed, how old is this sample of wood?
half-life of c-12 is 5700years
so if two and a half life have passed then the age of the fossil will be equals to 2.5*half life of c-12
age of wood= 2.5*5700 years
age of wood=14250 years
If a sample of wood is carbon dated and two half-lives have passed, how old is this sample of wood?
Some fossil bones containing 1/32 of their original amount of carbon-14 are found. How many half-lives have passed? How old are the bones? (HINT: The half-life of carbon-14 is 5,730 years. If 1/8 of the original amount of carbon-14 was present, 1/8 = 1/23 or 1/(2x2x2), therefore 3 half-lives would have passed and therefore, the bones would be 5,730 years x 3 = 17,190 years old)
Carbon-14 has a half-life of 5,700 years. Suppose a sample of wood now has 12.5% as much Carbon-14 as it had when it formed. How old is the sample?
how many half-lives have passed if 87.5% of a substance has decomposed? how many if 99.999% has decomposed?
1) A 141 g sample of carbon from ancient wood is found to have an activity of 5.289 decays/min. a. How many half lives have elapsed since the tree was cut down? b. How many years have elapsed since the tree was cut down? would appreciate any help
After 2 half-lives have passed, what % of the original radioactive isotope remains?
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