select all the correct answers. sally works as a geologist in the southwestern united states. he plans to…

select all the correct answers. sally works as a geologist in the southwestern united states. he plans to choose an unstable isotope to find the absolute age of a rock sample. which two aspects must he consider before making his choice? there should be a sufficient amount of the selected isotope in the rock. the isotope should be one that decays at a very fast rate. the isotope must not be found in any neighboring rocks. the half - life of the isotope must be long enough to capture the age of the rock. there should be more than one unstable isotope in the rock.

select all the correct answers. sally works as a geologist in the southwestern united states. he plans to choose an unstable isotope to find the absolute age of a rock sample. which two aspects must he consider before making his choice? there should be a sufficient amount of the selected isotope in the rock. the isotope should be one that decays at a very fast rate. the isotope must not be found in any neighboring rocks. the half - life of the isotope must be long enough to capture the age of the rock. there should be more than one unstable isotope in the rock.

Answer

Brief Explanations:

To find the absolute age of a rock sample using an unstable isotope, there needs to be enough of the isotope in the rock for detection and analysis. Also, the half - life of the isotope should be long enough to cover the time span of the rock's age. A fast - decaying isotope may not be present in sufficient amounts for old rocks, and the presence or absence in neighboring rocks is not a key factor for determining the rock's age. Having more than one unstable isotope is not a necessary condition for age - determination with one isotope.

Answer:

There should be a sufficient amount of the selected isotope in the rock. The half - life of the isotope must be long enough to capture the age of the rock.