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## Homework Statement

The number of radioactive nuclei in a particular sample decreases over a period of 26 days to one-fifteenth of the original number. What is the half-life of the radioactive material, in days?

## Homework Equations

R=DN/Dt=(lambda)(N)=(N)(ln2/T1/2)

## The Attempt at a Solution

DN= N - (1/15)N

DT=26 days

Plugged these in and solved for T(1/2), but CAPA says my answer is wrong.