Im having trouble answering this question.(adsbygoogle = window.adsbygoogle || []).push({});

How long it takes for 80% of the carbon-14 to decay in an animal after it has died.

Carbon decays rate 0.012% per year.

So, my understanding is,

-(R = 0.00012 yr-1, t=1 yr)

R=Ro exp (-λt)

0.00012=Ro exp(-λ(1)) ---- (1)

-No = 0.8,

No=λRo

Ro=0.8/λ ------ (2)

To find λ, (2) into (1)

0.00012=0.8/λ exp(-λ(1))

∴ λ = 8.8 yrs-1

Now im stuck which equation i have to use to find the year?

Are my assumption above is correct?

**Physics Forums - The Fusion of Science and Community**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Carbon-14 in a dead animal

Loading...

Similar Threads - Carbon dead animal | Date |
---|---|

B Why is Carbon-14 Unstable? | Nov 28, 2017 |

I Radioactive decay of Carbon 14 | Aug 19, 2017 |

B Safety and legality of carbon-11 | Nov 28, 2016 |

B Carbon dating | Mar 6, 2016 |

Where can I get some animated carton of particle collision? | Jun 26, 2010 |

**Physics Forums - The Fusion of Science and Community**