Podcast
Questions and Answers
What does the y-axis in the graph represent?
What does the y-axis in the graph represent?
- The total number of atoms in the sample
- The percentage of daughter atoms
- The percentage of Carbon-14 atoms remaining (correct)
- The age of the sample in years
What is the significance of the smooth curve in the graph?
What is the significance of the smooth curve in the graph?
- It shows irregular fluctuations in decay rates.
- It indicates a linear relationship between age and Carbon-14.
- It is a model that applies only to non-radioactive elements.
- It represents the constant decay of Carbon-14 over time. (correct)
After how many years does a sample with 3.125% Carbon-14 approximate?
After how many years does a sample with 3.125% Carbon-14 approximate?
- 25,000 to 30,000 years (correct)
- 10,000 to 15,000 years
- 15,000 to 20,000 years
- 20,000 to 25,000 years
If 6.25% of Carbon-14 remains, what fraction of the initial amount is left?
If 6.25% of Carbon-14 remains, what fraction of the initial amount is left?
Flashcards
Half-life
Half-life
The time it takes for half of the radioactive atoms in a sample to decay into a different element.
Parent Atom
Parent Atom
The original, radioactive atom in a decay process (like carbon-14).
Daughter Atom
Daughter Atom
The atom that results from the decay of a parent atom.
Radioactive Decay
Radioactive Decay
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Beta Decay
Beta Decay
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Study Notes
Radioactive Decay of Carbon-14
- A rock sample contains 3.125% parent Carbon-14 atoms and 96.875% daughter atoms
- The graph displays the decay of Carbon-14 over time
- Locate 3.125% on the y-axis
- Follow the corresponding value to the curve on the graph
- The x-axis shows the approximate age of the sample
- Follow the line to the x-axis and note the value at that point
- By examining the graph, a sample with 3.125% Carbon-14 corresponds to an age of roughly 28,000 - 30,000 years
- This indicates approximately 2 to 3 half-lives have passed.
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