6.2 - Laws of Radioactive Decay
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Practice Questions
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What is radioactive decay?
💡 Hint: Think about nuclear instability.
Define half-life.
💡 Hint: It involves halving the quantity.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the equation representing the number of undecayed nuclei?
💡 Hint: Remember the exponential decay model.
True or False: The decay constant (λ) is a measure of the stability of a nucleus.
💡 Hint: Consider what high decay values signify.
2 more questions available
Challenge Problems
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A sample contains 800 atoms of a radioactive isotope with a decay constant of 0.346 year⁻¹. Determine how long it will take for only 100 atoms to remain.
💡 Hint: You'll have to apply logarithmic methods to isolate t.
If a radioactive isotope has a half-life of 20 years, how much of a 500g sample will remain after 80 years? Explain your reasoning step-by-step.
💡 Hint: Count the number of half-lives in 80 years first, then calculate accordingly.
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