Chemistry Edapt Unit 6 - Applications of Radiation
Which of the following technologies depend on radioactive isotopes to function? Select all that apply.
PET scans
Nuclear power generation
How many grams of a 4-gram sample of radioactive material will remain after two half-lives?
1 gram
A certain radioactive isotope has a half-life of 2400 years. How many half-lives have passed for a sample
of this material collected 12,000 years ago?
5
Oxygen-21 has a half life of about 3.5 seconds. How many half lives will have passed after 14 seconds?
4
Rn-221 has a half life of about 30 minutes. How many half lives have passed after 4 hours?
8
An unstable isotope has a half life of 3 days. How many kg of a 820 kg sample will remain after 6 days?
205 kg
Neodymium-161 h as a half life of about 500 ms. What % of a fresh sample of this material would I have
after 1 second?
Which of the following technologies depend on radioactive isotopes to function? Select all that apply.
PET scans
Nuclear power generation
How many grams of a 4-gram sample of radioactive material will remain after two half-lives?
1 gram
A certain radioactive isotope has a half-life of 2400 years. How many half-lives have passed for a sample
of this material collected 12,000 years ago?
5
Oxygen-21 has a half life of about 3.5 seconds. How many half lives will have passed after 14 seconds?
4
Rn-221 has a half life of about 30 minutes. How many half lives have passed after 4 hours?
8
An unstable isotope has a half life of 3 days. How many kg of a 820 kg sample will remain after 6 days?
205 kg
Neodymium-161 h as a half life of about 500 ms. What % of a fresh sample of this material would I have
after 1 second?
