Carbon Dating and Isotopes Concepts

The video tutorial explains the concepts of relative and absolute dating, focusing on how absolute dating determines the exact age of fossils using radioactive isotopes. It covers the structure of atoms, the instability of isotopes, and the process of radioactive decay. The concept of half-life is introduced, explaining how it helps determine the age of samples. The tutorial details the use of carbon-14 in dating fossils, its limitations for older fossils, and the need for isotopes with longer half-lives for dating ancient samples.

What is the primary focus of absolute dating?

• Comparing the relative ages of rock layers

• Finding the exact numerical age of fossils

• Identifying the location of fossils

• Determining the chemical composition of rocks

What is an isotope?

• An atom with an unstable nucleus

• An atom with a stable nucleus

• A compound with balanced protons and neutrons

• A molecule with extra electrons

What does the term 'half-life' refer to?

• The time it takes for a full sample to decay

• The time it takes for half of a sample to become stable

• The time it takes for a sample to double in size

• The time it takes for a sample to lose all its protons

How long is the half-life of carbon-14?

• 1,000 years

• 10,000 years

• 5,700 years

• 100,000 years

What happens to carbon-14 in a fossil after the organism dies?

• It increases in quantity

• It turns into carbon-12

• It remains unchanged

• It starts to decay into nitrogen-14

What is the disintegration product of carbon-14?

• Nitrogen-14

• Oxygen-16

• Helium-4

• Carbon-12

What happens to the amount of carbon-14 in a sample over time?

• It remains constant

• It increases exponentially

• It decreases exponentially

• It fluctuates randomly

Why is carbon-14 not suitable for dating fossils older than a million years?

• Its half-life is too long

• It is not present in older fossils

• It decays too quickly

• It has a short half-life

Which isotope is used for dating older fossils?

• Carbon-14

• Oxygen-16

• Potassium-40

• Hydrogen-3

What is the main reason carbon-14 is used to date younger fossils?

• It is stable in all conditions

• It is the only isotope that decays

• It has a short half-life

• It is abundant in all fossils