A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 5 years ago
Situation:
A geologist in South America discovers a bird skeleton that contains 80% of it's original amount of c14.
Find the age of the bird skeleton to the nearest year.
anonymous
 5 years ago
Situation: A geologist in South America discovers a bird skeleton that contains 80% of it's original amount of c14. Find the age of the bird skeleton to the nearest year.

This Question is Closed

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0you need the half life of c14 or else the "kvalue" without it you cannot solve this.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0ok now we can do it. first of all no matter what you start with you will have 80% when you are done. 80% = .8 so solve \[.8=e^{.0001t}\]for t \[ln(.8)=.0001t\] \[t=\frac{ln(.8)}{.0001}=2231\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0btw i hope it is clear why it doesn't matter what you start with. if you start with 100 grams then 80% of that is 80 so you would put \[80=100e^{.0001t}\] and the first step would be to divide by 100 to get \[.8=e^{.0001t}\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0oh then to get the variable out of the exponent take the natural log.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0\[e^y = x\] same as \[y=ln(x)\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so if \[e^{.0001t}=.8\] same as \[.0001t=ln(.8)\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0then divide to .0001 to get t. done
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.