has a half-life of 2.24 min. By what factor will the activity of a sample have decreased after 1.0 h?has a half-life of 2.24 min. By what factor will the activity of a sample have decreased after 1.0 h? ANSWER SHOULD BE 8.6 x 10^-9
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has a half-life of 2.24 min. By what factor will the activity of a sample have...
A sample of radioactive material is initially found to have an activity of 115 decays/min. After 4 d 22 h, its activity is measured to be 63 decays/min. 1) (a) Calculate the half-life of the material.
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A sample of 7.0×10^9 atoms that decay by alpha emission has a half-life of 70 min. How many alpha particles are emitted between t=50min and t=200min? Express your answer using two significant figures.
A) 13N decays with a half-life of approximately 10 min to produce 13C, a stable isotope of carbon. For a 1.0g sample of 13N, after one half-life, what mass of 13N remains? What has happened to the remaining mass? B) 223Ra decays by alpha emission with a half-life of 11.43 days. For a 1.0g sample of 223Ra, after one half-life, what mass of 223Ra remains? What has happened to the remaining mass?
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?
carbon-11 is used in medical imaging. the half life of this radioisotope is 20.4 min. what percentage sample remains after 50.0 min
The half-life for the radioactive decay of calcium-47 is 4.5 d. if a sample has an activity of 4.5 Ci after 9.0 d, what was the initial activity of the sample?