Iron-59 has a half-life of 45 days. Part A If 149 g of a radioactive iron...
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 + ?
Iron-59 is a radioisotope that is used to evaluate bone marrow function. The half-life of iron-59 is 44.5 days. How much time is required for the activity of a sample of iron-59 to fall to 19.0 percent of its original value? days Submit Answer values if needed for this question. Thallium-201 is used medically to diagnose heart problems. The half-life of thallium-201 is 72.9 hours. If you begin with 37.2 mg of this isotope, what mass remains after 189 hours...
with 1.50 g of Cu from a CuSO4 solution? 16. Iron 59 has a half-life of 44.5 days. It is a beta emitter used to monitor spleen function after trauma. If an accident victim receives a 5.6-uCi dose, what fraction of the Fe59 nuclei will have decayed after 17 days?
a radioactive material has a half life of 7 days. how many radioactive isotopes are left after 33 hours, if you had 7000000 isotopes in the beginning? Question 33 1 pts A radioactive material has a half life of 7 days. How many radioactive isotopes are left after 33 hours, if you had 7 000 000 isotopes in the beginning? Use 2 sig figs in your answer. < Previous Next >
The half-life for the radioactive decay of iron-55 is 2.7 years. From a 2.00 g sample of iron – 55, how many grams will be left after 13.5 years?
Iron-59 is a radioisotope that is used to evaluate bone marrow function. The half-life of iron-59 is 44.5 days. If you begin with 43.5 mg of this isotope, what mass remains after 55.2 days have passed? mg
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.
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
1) A sample of Fe-59 has a mass of 200 grams. If the half-life of Fe-59 is 45 days, how many days will it take until only 10 grams of the original sample remains? Give your answer to the nearest day. 2) Some years ago Ms. Lopez invested $5000 at 12% compounded monthly, and the account now contains $20000. How many years ago did she start the account? Give your answer to the nearest year.
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.