Astr 151 Lecture

Radioactive carbon-14 dating has determined that a fossil is 5.7 x (10^3) years old. What is the total amount of the original C14 present in the fossil?

• 0%

• 25%

• 50%

• 74%

What is the half-life of material X?

• 5,000 yr

• 10,000 yr

• 50,000 yr

• 100,000yr

Tags

NGSS.HS-PS1-8

A sample of wood found in an ancient tomb contains 25% of its original carbon-14. The age of this wood sample is approximately

• 2,800 years

• 5,700 years

• 11,400 years

• 17,100 years

Each of the objects below has different amounts remaining of the original radioactive material X. Which object is most likely the oldest?

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Tags

NGSS.HS-PS1-8

Which graph best shows the radioactive decay of carbon-14?

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Tags

NGSS.HS-PS1-8

According to the graph, what is the half-life of this isotope?

• 100 years

• 150 years

• 200 years

• 300 years

Tags

NGSS.HS-PS1-8

A whalebone that originally contained 200 g of carbon-14 now contains only 25 g. How many carbon-14 half lives have passed since this whale was alive?

• 1

• 2

• 3

• 4

Tags

NGSS.HS-PS1-8

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Tags

NGSS.HS-PS1-8

The theory that explains the formation of the solar system is called ____.

• Nebulis Theory
• Nebular Theory
• Big Bang Theory
• Big Nebulan Theory

What is the nebular hypothesis?

• Prediction about how the universe was formed
• Prediction of how the moon was formed
• Prediction of how comets were formed
• Prediction of how the Solar System was formed