1.3 learn: Radiometric dating
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what fraction of a substance would be left after 5 half-lives?
1/32
if you start with 100 grams of hydrogen-3, how many grams will you have after 24.6 years?
25
if you start with 100 grams of carbon-14 atoms, how many grams will you have in 5,730 years?
50
rocks and natural minerals, including those found from outside of earth ( e.g. asteroids and meteros)contsin a specific set of elements. some of those have unstable ayomic nuclei called isotopes. [ true or false]
true
if half of a radioactive istope decays in one hour, how much of the orginal istope will remain after three hours?
one eight of it.