Exit Check 8.2 - Radiometric Dating

Front

What is radiometric dating?

Back

A method used to determine the age of materials by measuring the decay of radioactive isotopes.

Front

What is a half-life?

Back

The time required for half of the radioactive parent isotopes in a sample to decay into daughter isotopes.

Front

If 100 grams of a parent isotope remains, how much will remain after 1 half-life?

Back

50 grams.

Front

How many half-lives have passed if 6.25% of the parent isotope remains?

Back

4 half-lives.

Front

What is the half-life of Carbon-14?

Back

5700 years.

Front

How do you calculate the age of a sample using half-lives?

Back

Multiply the number of half-lives by the length of one half-life.

Front

What is the significance of stable daughter isotopes in radiometric dating?

Back

They are formed from the decay of parent isotopes and help determine the age of the sample.

Front

Which radioactive isotope is commonly used to date organic materials?

Back

Carbon-14.

Front

What is the formula to find the remaining amount of a radioactive isotope?

Back

Remaining amount = Initial amount × (1/2)^(number of half-lives).

Front

How is the absolute age of rocks determined using radioactive dating?

Back

By comparing the ratio of parent isotopes to daughter isotopes in the rock.