CUHK 2024-03-13

What is the common method used to figure out the age of things?

• Carbon dating

• DNA testing

• Tree ring analysis

• Radiometric dating

What is the half-life of carbon-14?

• 5,730 years

• 50,000 years

• 10,000 years

• 1,000 years

Why is radioactivity considered a random process?

• It only decays in specific conditions

• It can be controlled

• It follows a predictable pattern

• It has a 50-50 chance of decay at any moment

How do geologists estimate the age of Earth using zircon crystals?

• By analyzing the crystal's color

• By measuring the crystal's weight

• By studying the crystal's hardness

• By examining the decay of uranium to lead within the crystal

Which isotope is considered more radioactive based on its half-life?

• Lead-206

• Carbon-14

• Uranium-238

• Potassium-40