5. A sample with 4.0x 1015 atoms has an activity of 3.50 1012 Bq. It has...
5. A sample with 4.0x10'15 atoms has an activity of 3.50x 1012 Bq. It has a half-life of 600 years. (a) How much is the decay constant? (2 marks) (b) How much time will it take to drop to one-quarter of its original amount? (2 marks)
ivity of 3.50 10 Bq. It has a half-life of Asample with 4.0×1015 atoms has an acti 600 years 5. (a) How much is the decay constant? (2 marks (b) How much time will it take to drop to one-quarter of its original amount? (2 marks)
A sample of radioactive material contains 1.1E15 atoms and has an activity of 6.3E11 Bq. What is its half-life? A sample of radioactive material contains 1.1 x 1015 atoms and has an activity of 6.3 x 1011 Bq. What is its half-life? 1.16E3 X Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to...
What's this nuclide's half-life? A radioactive sample containing 1.20×1017 nuclei has activity 2.45×1012 Bq .
Constants and Conversion Factors 1 Bq - 1 decay/s 1 Ci 3.7 x 101°Bq Avogadro's number Number of atoms per mole 6.023 x 1023 4) If you have 2 x 1012 atoms of 131Cs, what will the activity be after 50 years? Half life of 137Cs is about 30 years. 6.205E-9 Bq Submit Help Your submissions: 6.205E-9 x Computed value: 6.205E-9Submitted: Sunday, July 8 at 6:49 PM Feedback: 5) How much activity will there be in 137Cs after 50 years...
A sample of radioactive material is initially found to have an activity of 114 Bq. After 4 days and 5 hours, the activity of the sample is found to be 85 Bq. 1) Calculate the disintegration constant of this material. 1 = 51 Submit 2) Calculate the half-life of the material. T12- days Submit 3) How long from the beginning (when the activity was 114 Bq) did it take for the sample to reach an activity of 10 Bq? t...
What is the activity of the sample in Bq? Cobalt-60, which undergoes beta decay, has a half- life of 5.26 yr. N = 3.14x1013 B-particles SU Previous Answers All attempts used; correct answer displayed Part B What is the activity of the sample in Bq? t V AC o XD x x x XI .X.10 > . Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining
The Cadmium isotope 109Cd is radioactive. A sample begins decay with 1012 Cd atoms. After 500 days, 4.7 x 1011 atoms remain. What is the half-life of this sample? (a) 46 days (b) 102 days (c) 459 days -- right answer but not sure how to get it (d) 662 days (e) none of the above
12. A radioactive sample takes 3.5 minutes to reduce its activity from 2.0 10 Bq to 7.5-10 Bq. Calculate the half life of the sample. [2 marks]
A sample has a C614 activity of 0.0089 Bq per gram of carbon. (a) Find the age of the sample, assuming that the activity per gram of carbon in a living organism has been constant at a value of 0.23 Bq. (b) Evidence suggests that the value of 0.23 Bq might have been as much as 44% larger. Repeat part (a), taking into account this 44% increase.