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 11
A 10 g sample of a radioactive isotope decays to 2.5 g in 6 hours. What is the half-life of the isotope?
A 120 g sample of a radioactive isotope decays to 15 g in 4 half-lives. What is the mass remaining after 2 half-lives?
A 200 g sample of a radioactive isotope decays to 25 g in 3 days. What is the half-life of the isotope?
A 400 g sample of a radioactive isotope decays to 50 g in a certain period. How many half-lives have passed?
A 50 g sample of a radioactive isotope is left for 3 half-lives. How much of the sample remains?
A radioactive isotope has a half-life of 15 days. How many days will it take for a sample to decay to 1/8 of its original amount?
A radioactive isotope has a half-life of 2 days. If you start with 32 g, how much will remain after 6 days?
A radioactive isotope has a half-life of 24 hours. If you start with 160 g, how much will remain after 72 hours?
A radioactive sample has a half-life of 12 hours. If you start with 64 g, how much will remain after 36 hours?
A radioactive sample has a half-life of 6 hours. How much of a 48 g sample will remain after 18 hours?
A sample contains 80 mg of a radioactive isotope. After 2 half-lives, how much of the isotope remains?
A scientist finds that a sample of a radioactive element has decayed to 1/16 of its original amount in 24 days. What is the half-life of the element?
After 4 half-lives, what fraction of a radioactive sample remains?
Describe how you would determine the half-life of a radioactive isotope experimentally.
Explain the difference between half-life and mean life of a radioactive isotope.
Explain why the half-life concept is important in radioactive dating techniques.
Explain why the half-life of a radioactive isotope is considered a constant property.
If 25% of a radioactive sample remains after a certain period, how many half-lives have passed?
If a radioactive isotope has a half-life of 20 minutes, how much of a 80 g sample will remain after 1 hour?
If a radioactive isotope has a half-life of 3 days, how many days will it take for a sample to decay to 1/64 of its original amount?
