Using half life to determine the age of a piece of coal 

I would fail without your explanations. You make it look so easy.

I want to take this man's hand in marriage!

u have saved my life ur so awesome

Funny when you call out students inattention in vids. Britney is famous8 years later. Lol

You’ve definitely helped me get through MAT109

This saved me

Hello,Mr.Brian Mclogan..Your presentation was nice...I have a question.Scientists found a fossilized bone from an organism in a deep layer of rock.When they took the bone back to the lab they realized that the bone had only 12.5percent of total Carbon 14 left.Based on the amount of carbon 14 left in the bone how old is the bone.?half life:carbon 14-5730 years..thank you

This video is pure gold. Thank you for making this!

I have a question. Is it rare that a fossil has color? I found a leaf fossil which has some green leaves and I don't know if it's common. I tried googling it but didn't find anything.

how would I find the rate if it wasnt given to me?

I just finished my assignment thanks to you. Thank you so much!

Nice explination.

Hi, in the first formula you showed. y=ae^rt. t=5730. But how did you get in the second formula (ln.5/5370)*t . I am not sure how you went back to the variable t. I see e^r when r=(ln.5/5370) by why are there 2 T's. Thank you

2:50 I thought we knew what the half-life was and were trying to find out what the time is because it says how long ago was the coal burned

Great video

a represents both final and initial value?

No incorrect.. A carbon 14 test is good up to around 50,000 years

just wondering, why not use the formula A=A*/2^n?