Questions tagged 'Half-Life'
6 questions
Feb 19, 2025
After 15 minutes, 30 g of a sample of polonium-218 remain unchanged. if the original sample had a mass of 960 g, what is the half-life
After 15 minutes, 30 g of a sample of polonium-218 remains unchanged. If the original sample had a mass of 960 g, what is the half-life of polonium-218? Additionally, suppose you want to separate leav...
Assuming a half life of 1599 years, how many years will be needed for the decay of 15/16 of given amount of radium-226
Assuming a half-life of 1,599 years, how many years will it take for 15/16 of a given amount of radium-226 to decay?
The half life of a certain radioactive material is 36 days.
The half-life of a certain radioactive material is 36 days. An initial amount of this material has a mass of 487 kg. Please write an exponential function that models the decay of this material. Additi...
What fraction of a Sr-90 sample remains unchanged after 97.3 years
What fraction of a strontium-90 (Sr-90) sample remains unchanged after a period of 97.3 years?
32P is a radioactive isotope with a half-life of 14.3 days. If you currently have 30.3 g of 32P, how much 32P was present 2.00 days ago?
32P is a radioactive isotope with a half-life of 14.3 days. If I currently have 30.3 g of 32P, how much of this isotope was present 2.00 days ago?
The half-life of bromine-74 is 25 min. How much of a 4.0mg sample is still active after 75 min?
What is the remaining mass of a 4.0 mg sample of bromine-74 after 75 minutes, given that its half-life is 25 minutes? a) 0.50 mg b) 1.0 mg c) 2.0 mg d) 0.25 mg e) 4.0 mg