Practice Half-life (12.6) - Radioactivity

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6 sample questions

Question 1.
If the half-life of an isotope is 4 days, how much of a 64g sample remains after 8 days?
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Remember to halve the amount for each half-life.
Question 2.
What does the term 'half-life' refer to?
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Think about the definition and its application to decay.
3Question 3.
What is the definition of half-life?
- The time for a radioactive nucleus to decay completely
- The time taken for half the number of radioactive nuclei to decay
- The time taken for a stable isotope to form
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Focus on the term 'half' in half-life.
4Question 4.
True or False: The half-life is constant for a given isotope.
- True
- False
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Remember the definition of half-life.
Question 5.
A radioactive substance has a half-life of 12 years. If a sample initially has 1600 grams, calculate the amount left after 48 years. Show your work.
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Count how many 12-year intervals are in 48 years.
Question 6.
How would you determine the age of a sample using its half-life? Explain the process.
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Think about how carbon dating works.

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