A radioactive nucleus A ($t_{1/2}$= 42.6 s) with initial number 9420 nuclides. The activity (in Bq) after 95 s equal: a. 32.67 b. 21.89 c. 14.73 d. 17.42 e. 27.05
Added by Sandra S.
Close
Step 1
The decay constant is related to the half-life (t/2) by the equation: λ = ln(2) / t/2 λ = ln(2) / 42.6 s Show more…
Show all steps
Your feedback will help us improve your experience
Prabhat Tyagi and 82 other Physics 103 educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
The half-life of the radioactive nucleus _(88)^(226)text(Ra) is 1.6 ✕ 103 yr. If a sample initially contains 3.90 ✕ 1016 such nuclei, determine the following: (a) the initial activity in curies µCi (b) the number of radium nuclei remaining after 4.7 ✕ 103 yr nuclei (c) the activity at this later time µCi (a) Find the number of remaining radium nuclei after 3.40 ✕ 103 yr. N = nuclei (b) Find the activity at this time. R = µCi
Frank D.
A sample of the radioactive nuclide $^{199} \mathrm{Pt}$ is prepared that has an initial activity of $7.56 \times 10^{11}$ Bq. (a) 92.4 min after the sample is prepared, the activity has fallen to $9.45 \times 10^{10}$ Bq. What is the half-life of this nuclide? (b) How many radioactive nuclei were initially present in the sample?
The radioactive nuclide $^1$$^9$$^9$Pt has a half-life of 30.8 minutes. A sample is prepared that has an initial activity of 7.56 $\times$ 10$^1$$^1$ Bq. (a) How many $^1$$^9$$^9$Pt nuclei are initially present in the sample? (b) How many are present after 30.8 minutes? What is the activity at this time? (c) Repeat part (b) for a time 92.4 minutes after the sample is first prepared.
Nuclear Physics
Activities and Half-Lives
Recommended Textbooks
University Physics with Modern Physics
Physics: Principles with Applications
Fundamentals of Physics
Watch the video solution with this free unlock.
EMAIL
PASSWORD