Half-Life Calculations
Chemistry ⇒ Nuclear Chemistry
Half-Life Calculations starts at 11 and continues till grade 12.
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See sample questions for grade 12
A 200 g sample of a radioactive isotope decays to 25 g in 3 hours. What is the half-life of the isotope?
A 50 g sample of a radioactive isotope decays to 6.25 g in 3 hours. What is the half-life?
A radioactive isotope decays from 64 g to 8 g in 12 hours. What is its half-life?
A radioactive isotope has a decay constant of 0.231 day-1. Calculate its half-life.
A radioactive isotope has a half-life of 24 hours. How much of a 32 g sample will remain after 72 hours?
A radioactive sample has a half-life of 2 days. If you start with 40 g, how much will remain after 6 days?
A sample contains 80 mg of a radioactive isotope. After 2 half-lives, how much remains?
A scientist starts with 160 g of a radioactive material. After 3 half-lives, how much material is left?
Define half-life in the context of nuclear decay.
Describe the mathematical relationship between the number of half-lives and the fraction of radioactive material remaining.
Explain how the concept of half-life is used in radiometric dating.
Explain why the half-life is useful in determining the safety of radioactive waste disposal.
Explain why the half-life of a radioactive isotope is considered a constant property.
If 10 g of a radioactive substance remains after 3 half-lives, what was the original mass?
If a radioactive isotope has a half-life of 15 years, how many years will it take for 87.5% of the sample to decay?
If a radioactive isotope has a half-life of 2 years, what percentage of the original sample remains after 6 years?
If a radioactive sample decays to 1/64 of its original amount in 18 hours, what is its half-life?
If a radioactive sample has a half-life of 5 hours, what fraction of the original sample remains after 15 hours?
If a sample has a half-life of 6 hours, how long will it take for only 1/32 of the original sample to remain?
If the decay constant (λ) of a radioactive isotope is 0.693 day-1, what is its half-life?
