# chemistry

posted by .

A 1.00-g 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? The half-life of carbon-14 is 5.73×103 year.
d. less than a few years

• chemistry -

Typo: The half-life is 5.7x10^3

• chemistry -

Without even doing the math it the change in disintegrations is merely .03333, the sample must have decayed for

d. less than a few years

• chemistry -

whoops, i did the math and it came out to about 34,400 years. Sorry for my earlier answer

• chemistry--can't get 34,000 yrs -

k = 0.693/t1/2
k = 0.693/5.7E3 = 1.22E-4

ln(15.3333/15.3) = 1.22E-4(t)

• chemistry -

vanden bout

• chemistry -

actually drake was right on his first answer i had this question on my homework and it is d. less than a few years :)

## Similar Questions

1. ### college geology dealing with carbon 14

ok in my professors notes he calculates carbon 14 age in an example. The problem goes like this: Sample contains 110g carbon sample produces 70 disintegrations per minute. That is 0.7 disintegrations per minute. T=(1/lambda)ln(N0/Nt) …
2. ### college geology help please

I was the same person from yesterday. I need help on a question. I don't type very good so I have one of my host family do it for me. so please help us. Suppose you have a sample of clamshell at a Paleoindian site and you measure the …
3. ### college Geol 101

Suppose you have a sample of clamshell at a Paleoindian site and you measure the 14C activity of a 100-gram sample of carbon as 320 disintegrations per minute (or 3.2 disintegrations per gram of carbon per minute). a.What was the activity …
4. ### chemistry

A 1.00-g 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?
5. ### Chemistry

The cloth shroud from around a mummy is found to have a carbon-14 activity of 8.1 disintegrations per minute per gram of carbon as compared with living organisms that undergo 15.2 disintegrations per minute per gram of carbon. From …
6. ### 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 …
7. ### science

The half-life 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
8. ### chem

I am not sure if there is an equation for this problem or wut?