Isotopes and Radioactive Dating Concepts

The video tutorial by Miss Block covers the concept of absolute age in Earth science, contrasting it with relative age. It explains radioactive dating, isotopes, and the concept of half-life, using examples like carbon-14 and uranium-238. The tutorial also discusses practical applications of these concepts in dating rocks and fossils, and demonstrates how to graph decay processes. The video concludes with a review of key concepts and encourages students to revisit the material if needed.

What is the main difference between absolute age and relative age?

• Absolute age provides a numerical age, while relative age is a comparison.

• Relative age provides a numerical age, while absolute age is a comparison.

• Both absolute and relative age provide numerical ages.

• Neither absolute nor relative age provide numerical ages.

Which subatomic particle is found in the nucleus and has a positive charge?

• Isotope

• Electron

• Proton

• Neutron

What is an isotope?

• An element with the same number of neutrons but a different number of protons.

• An element with the same number of protons but a different number of neutrons.

• An element with a different number of electrons.

• An element with a different number of protons.

What is the result of having an unequal number of neutrons to protons in an atom?

• The atom becomes an isotope.

• The atom becomes a different element.

• The atom becomes non-radioactive.

• The atom becomes stable.

What is the half-life of Carbon-14?

• 1.3 billion years

• 49 billion years

• 5,700 years

• 4.5 billion years

Which isotope would be most suitable for dating a woolly mammoth?

• Potassium-40

• Carbon-14

• Rubidium-87

• Uranium-238

Why is the decay rate of isotopes considered constant?

• It changes with the amount of isotope present.

• It changes with temperature.

• It changes with pressure.

• It remains unchanged regardless of external conditions.

How many years have passed if a sample has gone through two half-lives of Carbon-14?

• 11,400 years

• 5,700 years

• 22,800 years

• 17,100 years

What happens to the percentage of radioactive material as time increases?

• It increases.

• It remains constant.

• It decreases.

• It fluctuates randomly.

What is the significance of using the appropriate radioactive isotope for dating?

• It has no effect on the dating accuracy.

• It makes the item look older.

• It makes the item look younger.

• It ensures accurate dating of the item.