The half-life on an isotope is one day. At the end of three days, how much of the isotope remains?
A) none
B) one-quarter
C) one-eighth
D) one-half
E) none of these

Question

Quizplus · Accepted Answer

The half-life of an isotope is the time it takes for half of it to decay. After one day, half remains. After two days, half of that half remains, which is one-quarter. After three days, half of the one-quarter remains, which is one-eighth.

The Half-Life on an Isotope Is One Day