Question text
39 The half-life of a radioactive isotope is 2.5 minutes. This isotope is the only radioactive isotope in a radioactive sample. Between time t = 0 and t = 7.5 minutes, the mass of this isotope in the sample decreases by 70μg. What is the mass of this isotope at t = 0? A 75μg B 80μg C 210μg D 560μg
39 The half-life of a radioactive isotope is 2.5 minutes.
This isotope is the only radioactive isotope in a radioactive sample.
Between time t = 0 and t = 7.5 minutes, the mass of this isotope in the sample decreases by
70μg.
What is the mass of this isotope at t = 0?
A 75μg B 80μg C 210μg D 560μg
Select your answer: