In an unweathered sample of igneous rock,the ratio of an unstable isotope to its stable daughter isotope is 1:15.If no daughters were present at the time the rock cooled below closure temperature,and the half-life of the isotope is 50 million years,how old is the rock?
A) 200 million years
B) 400 million years
C) 750 million years
D) 1 billion years

Question

In an unweathered sample of igneous rock,the ratio of an unstable isotope to its stable daughter isotope is 1:15.If no daughters were present at the time the rock cooled below closure temperature,and the half-life of the isotope is 50 million years,how old is the rock? 
A) 200 million years 
B) 400 million years 
C) 750 million years 
D) 1 billion years

Quizplus · Accepted Answer

The Answer of In an unweathered sample of igneous rock,the ratio of an unstable isotope to its stable daughter isotope is 1:15.If no daughters were present at the time the rock cooled below closure temperature,and the half-life of the isotope is 50 million years,how old is the rock? 
A) 200 million years 
B) 400 million years 
C) 750 million years 
D) 1 billion years

In an Unweathered Sample of Igneous Rock,the Ratio of an Unstable