Question

a sample of radium - 226 will decay to ¼ of its original amount after 3200 years. what is the half - life of radium - 226? years

Explanation:

Step1: Understand decay concept

Decay to ¼ means two - half - life periods.

Step2: Calculate half - life

Let the half - life be $t$. If 2$t$ = 3200 years, then $t=\frac{3200}{2}$.

Answer:

1600