A radioactive sample has an initial activity of 400 decays/s. Its activity 22 hours later is...

Question

Question

A radioactive sample has an initial activity of 400 decays/s. Its activity 22 hours later is 25 decays/s. What is its half-life

Can you show how you do this. thank you

Answer 1

Answer #1

In each half life activity decreases to by 1/2 Ni= 400 , Nf = 25 Graphically 25 go !00 200 400 471/237 || 2+1/2 1/2 .. 4 half

Hope this helps...

Answer 2

Similar Homework Help Questions

A radioactive material initially is observed to have an activity of 900 decays/sec. If 10.0 hours...

A radioactive material initially is observed to have an activity of 900 decays/sec. If 10.0 hours later it is observed to have an activity of 100 decays/sec, what is its half-life?
These questions are about radioactive half-life. 22. 256 grams of a radioactive sample decays to 4...

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...

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 115 decays/min. After...

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.
36. A radioactive material initially is observed to have an activity of 1000 decays/sec. If three...

36. A radioactive material initially is observed to have an activity of 1000 decays/sec. If three hours later it is observed to have an activity of 125 decays/sec, what is its half-life? A. 1/2 hour B. 1 hour C. 3 hours
A) A radioactive material produces 1220 decays per minute at one time, and 4.2 h later...

A) A radioactive material produces 1220 decays per minute at one time, and 4.2 h later produces 150 decays per minute. What is its half-life? B) What fraction of a sample of 6832Ge, whose half-life is about 9 months, will remain after 3.5 yr ? C) What is the activity of a sample of 146C that contains 7.0×1020 nuclei? The half-life of 146C is 5700 years.

A sample decays to 50% of its original activity after 24.3 hours. Determine the sample\'s half-life.

A sample decays to 50% of its original activity after 24.3 hours. Determine the sample\'s half-life.
A sample of a certain radioactive substance is prepared, and its initial activity is 4 µCi....

A sample of a certain radioactive substance is prepared, and its initial activity is 4 µCi. After 2.4 hours, the activity is measured to be 1 µCi. What is the half-life of this material?
The decay curve of a radioactive nuclide sample is shown. Its initial activity is measured to...

The decay curve of a radioactive nuclide sample is shown. Its initial activity is measured to be X Bq. 14. What is the population at t=8.0 15. After how many half lives will the population be 125 nuclides? 16. What will be the level of activity (in terms of X) after two half lives have elapsed? 17. What would the activity of the above sample be if we tripled its size? 18. If the initial activity of 0.356 grams of...

41. | An investigator collects a sample of a radioactive isotope with an activity of 370,000...

41. | An investigator collects a sample of a radioactive isotope with an activity of 370,000 Bq. 48 hours later, the activity is 120,000 Bg. What is the half-life of the sample? 207 . 1 22