A radioactive isotope has decayed to the point that one-eighth of the original content is left.How many half-lives have passed?
A)0
B)1
C)2
D)4

Name: A radioactive isotope has decayed to the point that one-eighth of the original content is left.How many half-lives have passed? A)0 B)1 C)2 D)4
Brand: Quizplus
Rating: 4.9 (42 reviews)

Question

Quizplus · Accepted Answer

Three half-lives have passed because with each half-life, the amount of the isotope is reduced by half: after one half-life, half remains; after two, one-quarter remains; and after three, one-eighth remains.

A Radioactive Isotope Has Decayed to the Point That One-Eighth