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This quiz contains 9 questions from a mix of 1 subtopics.
Which of the following is true about carbon-14 dating?
living organisms absorb carbon-14 from the atmosphere
the comparison of the remaining carbon-14 enables the dating of archaeological samples
upon death, the decay of carbon-14 in the organisms begins
all of the above
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What is the approximate half-life of carbon-14?
7,573 years
10,000 years
1.21 x 10-4 years
5,730 years
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Which of the following materials can be dated using carbon-14?
metal
wood
bone
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Describe the process of radioactive dating using carbon-14. Include the key points that make carbon-14 suitable for archaeological dating.
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Calculate the age of an archaeological bone sample if it shows a carbon-14 activity of 0.05 Bq now, when initially it had an activity of 0.2 Bq. The decay constant for carbon-14 is 1.21 x 10-4 per year.
7,573 years
11,460 years
15,146 years
22,920 years
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A radioactive substance has an initial number of 2.0 x 106 nuclei. After 3,000 years, calculate the number of undecayed nuclei remaining if the decay constant is 2.4 x 10-4 per year.
0.97 x 106
0.86 x 106
1.21 x 106
1.32 x 106
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If a radioactive source has an initial activity of 0.8 Bq and decays to 0.2 Bq in 5,000 years, what is the decay constant of this radioactive isotope?
2.77 x 10-4 per year
5.83 x 10-4 per year
1.21 x 10-4 per year
3.92 x 10-4 per year
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Determine the number of undecayed nuclei left after 2,500 years if the original number was 5.0 x 105 nuclei and the decay constant is 3.0 x 10-4 per year.
3.75 x 105
2.36 x 105
2.5 x 105
4.25 x 105
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An archaeological sample initially had a carbon-14 activity of 0.4 Bq. After an unknown period, its activity is measured at 0.05 Bq. If the decay constant for carbon-14 is 1.21 x 10-4 per year, estimate the age of the sample.
12,560 years
17,186 years
15,146 years
18,920 years
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