Using differential equations to determine the decay constant for carbon-14

[mistymoon_38]

Homework Statement

Q(t) is the amount of carbon 14 at time t. Given half life of 5730 years, and assuming that Q satisfies dQ/dt=-rQ; determine decay constant r

Homework Equations

The Attempt at a Solution

I solved the differential equation and got Q=ce^-rt. Now what? And hints/help?

 

[gabbagabbahey]

The half life is 5730 years, that means that Q(5730)=(1/2)Q(0)

 

[mistymoon_38]

thanks i figured it out