Question

2) We often use radio-isotopes to estimate the age of things (such as the
Earth). Assuming the half-life of some isotope is 1000 years, and

Answer 1

2) We often use radio-isotopes to estimate the age of things (such as the
Earth). Assuming the half-life of some isotope is 1000 years, and you
found a rock of unknown age near the Mid Atlantic Ridge. You measured
the amount of isotope in the rock and determined that 12.5% of the
original amount when the rock formed was still present. How old is the
rock