The activity of a sample of 35 16S (T12=87.32days) is 3.05×104 decays per second. What is the mass of the sample?
The activity of a sample of 35 16S (T12=87.32days) is 3.05×104 decays per second. What is...
For a 90 mg Ra-226 sample (T12 = 1,600 years) with an activity of 3.29 x 10 Bq, compute the following. (a) 1 in Bq) Bg (b) the number of atoms in the sample, based on mass considerations atoms (c) the number of atoms in the sample based on its activity atoms
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
An ancient wooden club is found that contains 87 g of carbon and has an activity of 7.0 decays per second. Determine its age assuming that in living trees the ratio of 14C/12C atoms is about 1.3×10−12 csn you please explain every step, thank you
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.
1. The remains of a pre-historic human are found. The mass of carbon in the sample is 8.5kg. The activity i.e. the number of decays per second is 700 decays/second. In living matter the ratio of 14c/?C=1.3. 10-12 14C is radioactive, whereas 12C is stable. Carbon's atomic mass is 12g per 6.02.102 atoms. The halflife of carbon is 5730 years. Make sure to label the different parts of your answer! a) How many carbon atoms are in the sample? b)...
A sample decays to 50% of its original activity after 24.3 hours. Determine the sample\'s half-life.
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?
11. (5 pt) For a 1 mCi sample, what is the activity of 18F in Bq? 18F decays by positron emission with a half-life of 109 minutes. a. 3.7 x 104 Bq b. 3.7 x 107 Bq c. 3.7 x 1010 Bq d. 2.7 x 10-3 Bq e. 2.7 x 10-11 Bq
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.
35. A certain radio-nuclide decays by emitting an alpha-particle. What is the difference between the atomic numbers of the parent and the daughter nuclides? 36. What is the difference in mass number between the parent and daughter nuclides after a beta-decay process?