ivity of 3.50 10 Bq. It has a half-life of Asample with 4.0×1015 atoms has an...
5. A sample with 4.0x 1015 atoms has an activity of 3.50 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)
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)
If a radionuclide has a half-life of 10 years, how many parent nuclide atoms will be left after 10 years since the start of the decay? How many daughter nuclides will exist at that time? Assume daughter nuclides are stable. Please show explanation, Thank You
If a radioactive isotope has half-life h, then the number of atoms in a sample is given by a(t)=a-2-/h where ao gives the number of atoms in the sample at time 0. The radio active decay of carbon-14 leads to clever way of determining the age of fossils and remnants of plants and animals. When an organism dies, the radioactive carbon- 14 in it decays, with half of it gone in 5,730 years. a. Suppose a mummified cat has a...
(d) Due to alpha decay, l mole of uranium-238 produces 2.96 106 alpha particles per second. Find the half-life, giving your answer in units of years. [5 marks] (e) The average mass of the atoms in a 0.100 kg block of pure carbon is 12.01 u. A small fraction of the atoms are radioactive, with a decay constant of 3.90 x 10-12s. If the activity of the carbon block is 97.8 Bq, calculate what fraction of the atoms are radioactive...
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...
6) Pu-239 is produced in the nuclear fuel cycle in nuclear power plants. The half-life of Pu- 239 is 24,000 years. If 500.0mg of Pu-239 are generated this year, how much will remain this month in the year 2683? (2 points) a. b. How much of the original 500.0 mg of Pu-239 will be left after 6 half-lives? (2 points) 7) Polonium-210 has a half-life of 140 days. How long will it take for a sample of 385g of Polonium-210...
Radium-226 is radioactive and has a half life of 1600. years. How long would it take a sample to decay from 8.80 mg to 3.50 mg. Round your answer to 2 significant digits. years x 5 ?
8. Fermium-253 has a half-life of 0.334 seconds. A radioactive sample is considered to be completely decayed after 10 half-lives. How much time will elapse for this sample to be considered gone? 9. 100.0 grams of an isotope with a half-life of 36.0 hours is present initially. How ma time will have elapsed when 5.00 grams remains? 131 (half-life = 8.040 days) to decay to 10. How long will it take for a 40.0 gram sample of 1-131 (half-life =...
2. Half-life is the time required for half of an amount of a particular compound to degrade (see table below). The half-life of DDT in the soilis from 2 to 15 years, and the half-lite of DDT in an aquatic environment is 150 years. 1 half-life 2 half-lives 3 half-lives 4 half-lives 5 half-lives 50% degraded 75% degraded 88% degraded 94% degraded 97% degraded a. If the original concentration of DDT in the water is 2 ppm, how much DDT...