Radioactive Dating, calculating age?

[boltonfan]

Homework Statement

The age of the dead sea scrolls was measured using radiocarbon dating. If the measurement gives a ratio of 0.78 for the ratio of the activity in the sample to the activity in a sample of corresponding live material of similar mass, calculate the age of the scrolls.

Homework Equations

N=N°e^λt λ=ln2/t^1/2


Can anybody shed some light?

thanks,

 

[tiny-tim]

welcome to pf!

hi boltonfan!

(try using the X² button just above the Reply box )

show us what you've tried, and where you're stuck, and then we'll know how to help!