Do you know the units for activity?
Half-Life Quiz
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Question 1 of 11Question 1
Match the definition with the correct term. The …. of a substance is the number of nuclear decays per second.
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Question 2 of 11Question 2
Which of the following units do we use to measure the number of nuclear decays per second?
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Question 3 of 11Question 3
What is the term used to describe the amount of time taken for half of a sample to decay?
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Question 4 of 11Question 4
Which of the following statements is accurate?
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Question 5 of 11Question 5
Match the following definition with the correct term. …… is the time taken for the activity of a source to decay by half.
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Question 6 of 11Question 6
Which two of the following statements accurately describe the decay of unstable nuclei?
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Question 7 of 11Question 7
The half-life of a 25kg sample of caesium-137 is 30 years. What is the half life of a 12.5kg sample of caesium-137?
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Question 8 of 11Question 8
The graph shows the activity of two different radioactive substances. Determine the half-life of Source A (blue) in minutes. Do not add the units.
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Question 9 of 11Question 9
The graph shows the activity of two different radioactive substances. Determine the half-life of Source B (red) in minutes. Do not add the units.
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Question 10 of 11Question 10
The half-life of cobalt-60 is 5 years. If there are 100g of cobalt-60 in a sample, how much will be left after 15 years?
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Question 11 of 11Question 11
A sample of uranium-235 has a mass of 15kg. Given that the half-life of uranium-235 is 700 million years, calculate how long ago the sample would have been a mass of 240kg
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