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A 16ug sample of sodium-24 decays to 1.0 ug in 60 h. What is the half-life,...
a. what is the half life of a radioactive isotope if a 32.0g sample decays to 24.6g after 127 days? b. 76Kr has a half-life of 14.8 hours. How long will it take for 75% of the sample to decay?
The radioisotope sodium-24 is used to determine the levels of electrolytes in the body. A 16-μg sample of sodium-24 decays to 2.0 μg in 45 h. What is the half-life, in hours, of sodium-24? Express your answer in hours per half-lives to two significant figures.
Submit 1128.0% of a sample of silver-112 decays in 1.52 hours, what is the half-life of this isotope (in hours)? hours 12 3 6 4 0 x10口
A radioactive isotope decays by B" emission with a half-life of 1.0 min. During the first 1.0 min, a particular sample emits 1000 B particles. During the next 1.0 min, the number of B- particles this sample will emit will be closest to 250. 500. O 1000. 1500. 2000.
Sodium-24, which is used to locate blood clots in the human circulatory system, has a half-life of 15.0 hours. A sample of sodium-24 with an initial mass of 28.5 g was stored for 45.0 hours. How many grams of sodium-24 is left in the sample after 45.0 hours?
What is the half‑life of an isotope that decays to 25% of its original activity in 33.7 h? What is the half‑life of an isotope that decays to 12.5% of its original activity in 10.2 h?
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?
Q. 86 and 87
i. E) 1.8 x 104 mCi 86) Sodium-24 has a half-life of 15 hours. How many hours is three half-lives? A) 60 hours B) 45 hours C) 30 hours D) 15 hours E) 7.5 hours 87) Iodine 131 has a half-life of 8.0 days. An I-131 sample has an initial activity of 32 m What is the activity after 24 days? A) 96 mCi B) 16. mCi C) 8.0 mCi D) 4.0 mCi E) 2.0 mCi
A sample decays to 50% of its original activity after 24.3 hours. Determine the sample\'s half-life.