The half-life of a certain radioactive isotope is 6 h.If we start out with 10 g of the isotope, after 1 day there will be
A)none left.
B)0.625 g left.
C)1.6 g left.
D)2.5 g left.

Question

Quizplus · Accepted Answer

The half-life of a radioactive isotope is the time it takes for half of the atoms in a sample to decay. After 6 hours, half of the 10 g of the isotope will have decayed, leaving 5 g. After another 6 hours, half of the remaining 5 g will have decayed, leaving 2.5 g. After another 6 hours, half of the remaining 2.5 g will have decayed, leaving 1.25 g. After another 6 hours, half of the remaining 1.25 g will have decayed, leaving 0.625 g.

The Half-Life of a Certain Radioactive Isotope Is 6 H