Welcome to the Quiz!
This quiz contains 10 questions from a mix of 1 subtopics.
What is the term used to describe the likelihood of a radioactive isotope decaying per unit of time?
activity
radiation emission
half-life
decay constant
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Which of the following statements about the decay constant is true?
A higher decay constant indicates a slower rate of decay
the decay constant is crucial for calculating the activity
the decay constant is measured in Becquerels (Bq)
the decay constant is denoted by the symbol N
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What does the activity of a radioactive sample represent?
the amount of radiation emitted per second
the amount of nuclei decaying every second
the time taken for half of the nuclei to decay
the total number of undecayed nuclei
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A radioactive sample has 4.0 x 1015 undecayed nuclei and an activity of 3.2 x 109 Bq. What is the decay constant?
8.0 x 10-7 s-1
7.8 x 105 s-1
1.25 x 10-6 s-1
1.28 x 1025 s-1
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Explain the relationship between the decay constant and the rate of radioactive decay.
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A certain radioactive substance has a decay constant of 5×10−7 s−1. If the initial number of undecayed nuclei is 4.0×1012, calculate the activity of the substance.
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Calculate the half-life of a radioactive isotope with a decay constant of 3.0×10−3 s−1.
2,310 s
231 s
2.30258 s
0.231 s
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If a radioactive sample has a half-life of 4.0×104 seconds, what is its decay constant?
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Given a radioactive substance with a decay constant of 2.5×10−4 s−1, calculate its half-life.
2,760 s
2,850 s
2,772.8 s
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A sample of radioactive material initially has 6.0×1015 undecayed nuclei. If the activity of the sample is measured to be 3.0×109 Bq, what is the decay constant of the material?
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