You are trying to determine the age of a lava flow using an isotope with a half-life of 1.5 million years.If the sample has gone through four half-lives, what is the age of the rock?
A)1.5 million years
B)6 million years
C)375,000 years
D)5 billion years

Question

Quizplus · Accepted Answer

Each half-life represents 1.5 million years, so four half-lives represent 6 million years. Therefore, the age of the rock is 6 million years.

You Are Trying to Determine the Age of a Lava