You have an unknown radioactive material. If you start out with a 405 mg sample, and after 120 minutes, 53.1 mg remains, what is the half life?
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You have an unknown radioactive material. If you start out with a 405 mg sample, and...
A 50.0 mg sample of an unknown radioactive substance was placed
in storage and its mass measured periodically. After 70.9 days70.9
days, the amount of radioactive substance had decreased to 3.13
mg.
What is the half-life of the unknown radioactive substance?
half-life:
days
A 100-mg sample of a radioactive isotope is obtained. After 33.5 minutes, only 3.10 mg remains. What is the half-life of the isotope? min
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?
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.
These questions are about radioactive half-life.
22. 256 grams of a radioactive sample decays to 4 grams in 120
minutes. What is the half life of the sample?
These questions are about radioactive half-life 22. 256 grams of a radioactive sample decays to 4 grams in 120 minutes. What is the half life of the sample? 22.
These questions are about radioactive half-life.
22. 256 grams of a radioactive sample decays to 4 grams in 120
minutes. What is the half life of the sample?
These questions are about radioactive half-life. 22. 256 grams of a radioactive sample decays to 4 grams in 120 minutes. What is the half life of the 22. sample?
A sample of radioactive material is initially found to have an activity of 114 Bq. After 4 days and 5 hours, the activity of the sample is found to be 85 Bq. 1) Calculate the disintegration constant of this material. 1 = 51 Submit 2) Calculate the half-life of the material. T12- days Submit 3) How long from the beginning (when the activity was 114 Bq) did it take for the sample to reach an activity of 10 Bq? t...
A 1.6 mg sample of radioactive Ho-166 has a half-life of 26.8 years. What mass remains after 12 years? All radioactive decay processes are 1st order reactions. t1/2 = 0.693/k ln [A]t = -kt + ln [A
(2 points) An unknown radioactive element decays into non-radioactive substances. In 520 days the radioactivity of a sample decreases by 63 percent. (a) What is the half-life of the element? half-life: (days) (b) How long will it take for a sample of 100 mg to decay to 84 mg? time needed: (days)
An unknown radioactive element decays into non-radioactive substances. In 760 days the radioactivity of a sample decreases by 77 percent.(a) What is the half-life of the element?half-life: (days)(b) How long will it take for a sample of 100 mg to decay to 68 mg?time needed: (days)