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A 175 ng sample of radioactive material has a half life of 8.8 days. How many...
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 >
A sample begins with 96 ng of radioactive material. How much is left after 5 half lives? 0 19 ng O 3.0 ng 3.8 ng 9.6 ng SUBMIT
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. What percentage of a sample would be left after 107. days? Round your answer to 2 significant digits. % 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 ?
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
A Radioactive sample contains 2.1g of an isotope with a half- life of 3.8 days. How much of the isotope in grams will remain after 10.0 days? Express the answer to 3 significant figures.
After 1.96 days, the activity of a sample of an unknown type radioactive material has decreased to 91.2% of the initial activity. What is the half-life of this material?