Posted by **becky** on Wednesday, October 9, 2013 at 10:10pm.

the half life of the carbon isotope C14 is about 5700 years.

A. about how many years does it take 1000 grams of this substance to decay to 500 grams?

B. about what percent of the original amount would you expect to find after 1000 years?

- math -
**Reiny**, Wednesday, October 9, 2013 at 11:12pm
A. ummmhhh, 5700 years

(you said the half-life was 5700 years , 1000 g went to half, namely 500g)

b)

amount = 1000 (1/2)^(t/5700)

= 1000(1/2)^(1000/5700)

= 885.5 g

so 88.55% would remain after 1000 yrs

## Answer this Question

## Related Questions

- Math - _The_Natural_Base_e_ An accident in 1986 at the Chernobyl nuculear plant ...
- algebra - Scientists can determine the age of ancient objects by a method ...
- Pre Calculus - Exponential growth and decay find the half life of a radioactive ...
- Chemistry - Which radioactive sample would contain the greatest remaining mass ...
- algebra - A radioactive substance decays according to the formula A=A0e^kt where...
- Chemistry - What is the famous isotope used in archeological dating? carbon 12 I...
- earth science - what would be the chart to use for carbon 14 whcih has a half ...
- physics - The masses of 1 mole of various gases are as follows: hydrogen about 2...
- Physics - The masses of 1 mole of various gases are as follows: hydrogen about 2...
- calculus - The rate at which an amount of a radioactive substance decays is ...