Tuesday

September 23, 2014

September 23, 2014

Posted by **student012** on Monday, October 20, 2008 at 10:27pm.

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)

Then he substitutes:

t=(1/1.209*10^-4/year)ln(1600/70)

I just want to know where did he get 1600 from?

- college geology dealing with carbon 14 -
**bobpursley**, Monday, October 20, 2008 at 11:23pmNo is 1600 disintegrations per minute, it was the disintegrations per minute in the original sample at the beginning.

What concerns me is the last two lines of your text notes..

sample produces 70 disintegrations per minute, that is .7 diintegrations per minute. Huh?

- college geology dealing with carbon 14 -
**student012**, Tuesday, October 21, 2008 at 11:21amI wrote exactly what he had in his notes. so what should the actual t=? is everything else correct except the 1600? I have no examples in my book.

**Answer this Question**

**Related Questions**

Radioactivity - 1. A granite rock is thought to be about 2 billion years old. ...

Calculus - The amount of carbon-14 still present in a sample after t years is ...

physics - How do I do this ? Calculate the age of a plant sample that shows ...

geology - suppose you have a sample of clamshell at a paleoindian site and you ...

ChemB - The activity of carbon 14 in living tissue is 15.3 disintegrations per ...

science - The half-life of carbon 14 is 5730 years. if a 1 g sample of old ...

Chem - Living organisms give a Carbon-14 decay rate of 15.3 counts/min for each ...

college geology help please - I was the same person from yesterday. I need help ...

chemistry - A 1.00-g sample of carbon from a modern source gave 15.3 ...

chemistry - A 1.00-g sample of carbon from a modern source gave 15.3 ...