Question

which information can be determined using half - life? age of material type of particle released percentage of rock that has aged number of radioactive particles left

Explanation:

Half - life is used in radioactive decay calculations. The formula for radioactive decay $N = N_0(\frac{1}{2})^{\frac{t}{T_{1/2}}}$ can be used to find the number of radioactive particles left ($N$), where $N_0$ is the initial number of particles, $t$ is the time elapsed, and $T_{1/2}$ is the half - life. While half - life can be related to age determination (but requires more assumptions and data about initial amounts etc.), it doesn't directly determine the type of particle released. And "percentage of rock that has aged" is a less direct and less precise use compared to finding the number of remaining radioactive particles.

Answer:

D. number of radioactive particles left