After three half-lives have elapsed, what fraction of the original amount of radionuclide remains? 1/3
1/4
None of these
1/8

Becquerel expected to find ( he developed the photographic plate that had sun-exposed minerals on top of it. becquerel expected to find ( he developed the photographic plate that had been in the closed drawer.

Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

When the water vapor cools it condenses select a number that represents his process on the