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5 cards from this section. Quick, good the night before a test.
What is the definition of half-life?
Think of what happens to a fraction of the substance.
What does the decay constant (λ) represent?
Consider it a measure of how quickly something changes.
What is the half-life of a radioactive substance?
Consider the definition!
True or False: The decay constant (λ) is inversely proportional to half-life.
Remember how they relate in the formula.
If you have a sample of a radioactive isotope with an initial quantity of 800 grams and a half-life of 3 years, how much of the substance will remain after 9 years?
Calculate how many half-lives fit into the total time.
An isotope has a half-life of 5 years. If you start with 120g, how much will remain after 15 years?
Identify the number of times the half-life fits into the total time.
6 more questions in this section. Enroll free to practise them all.
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