a radioactive material has a half life of 7 days. how many radioactive isotopes are left...
A 175 ng sample of radioactive material has a half life of 8.8 days. How many ng of radioactive material is left after 3 half lives? Do not put units in your answer
91. If the half – life of a sample of radioactive material is 60 days, what fraction of the original radioactive nuclei will remain after 120 days.
Iodine-125 is radioactive and has a half life of 60.25 days. How much of a 5.80 mg sample would be left after 40.0 days? Round your answer to 2 significant digits. Also, be sure your answer has a unit symbol.
Iodine-125 is radioactive and has a half life of 60.25 days. How much of a 7.40 mg sample would be left after 243. days? Round your answer to 2 significant digits. Also, be sure your answer has a unit symbol. 0 X ?
Iodine-125 is radioactive and has a half life of 60.25 days. How much of a 7.40 mg sample would be left after 243. days? Round your answer to 2 significant digits. Also, be sure your answer has a unit symbol. 0 0.0 X ?
Question 4 1 pts A particular radioactive isotope has a half-life of 2.90 weeks. What fraction of the original sample is left after 101.5 days? 1/8 1/64 1/32 1/16 none of these Next
Iodine-125 is radioactive and has a half life of 60.25 days. What percentage of a sample would be left after 107. days? Round your answer to 2 significant digits. % X + ?
A radioactive SPECT tracer has a radioactive half-life of 6 hours. If it takes 12 hours to ship the material from the manufacturer to the hospital, how much of the original radioactivity remains in the material when it arrives at the hospital? A radioactive PET tracer has a radioactive half-life of 1 hour. If it takes 12 hours to ship the material from the manufacturer to the hospital, how much of the original radioactivity remains in the material when it...
If the half-life of a radioactive isotope is 32 days, how many half-lives must pass before a 3000mg sample is less than 0.03g? 05 O 2 07 More information is needed. 9
The half-life of a radioactive isotope is 220 d. How many days would it take for the decay rate of a sample of this isotope to fall to 0.47 of its initial rate?