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- A certain radioactive element has a half life of 3725 years. How much of a 8.03 g sample is left after 2035 years? Answer: What is the energy released when 0.520 g are converted to energy? Express your answer in joules. For self-consistent units you must use kg because 1 J-1 kg m²/s².The isotope Carbon 14 decays by β emission and has a half-life of 5730 years. The carbon in living matter has an activity of 15.3 counts/minute/gm. A sample of ancient papyrus shows a count of 4.1/hour/gm. What is the approximate age of the papyrus? Select one: a. 730 years. b. 44,700 years. c. 10,900 years. d. 7,300 years.37. A sample of 4 g of cobalt isotope is produced. If the half-life of is 30 years, what will be the mass of the cobalt remaining after 90 years? Please show all work (ref: p.808-813) hulu video F2 F3 F4 FS F6 F7 F8 FS & 5 8. R Y (O 图 图 LO T LL
- l AT&T ? 10:47 AM 41% O + A ... 7. Define radioactive decay. Answer: 8. Describe this picture in your own words Nuclear Fission During fission, the nucleus of an unstable atom releases energy when it splits into smaller atoms. How have humans harnessed the energy created by nuclear fission? Answer: 9. Define solar energy. This is the primary conversion of what loss? Answer: Solar energy is the heat or the light that is obtained f technologies such as solar heating and Solar thermal energy. 10. Watch the video Describe it in at least 2. B I U A7. How does the uranium used in a CANDU reactor exist in nature?What process are used to prepare the uranium to be used in a CANDU reactor? 8.What concerns exist about the mining and the processing of natural sources of uranium? Pls answer both of the questions i dont care about bartleby rules i will rate u helpful if u answer both in handwritten cursive answer No plagiarism ill doublecheckDATE NAME Half-life Practice 1. What is half-life? 2. If we start with 400 atoms of a radioactive substance, how many would we have after: a. one half-life? b. two half-lives? c. three half-lives? d. four half-lives? 3. If we start with 48 atoms of a radioactive substance, how many would remain after: a. one half-life? b. two half-lives? c. after three half-lives? d. after four half-lives? Using the graph to the right, answer the following questions. 4. What is the half-life of each element? 5. Which element has the shortest half-life? 10- 6. Which element is the most unstable? How do you know? Ago 10 years ) Use the graph on the to answer the following questions. 7. How many atoms are in the original sample size of this radioisotope? 8. How long is the half-life? 9. How many atoms are left after 2 half-lives? 10. Approximately how many days would have to pass for there to be only 2.5 atoms of the sample remaining? How many half-lives? Parcent ot Oniginal Mase Romaining
- 5. If a 10-gram sample of a radioactive substance has a half-life of 6000 years, how much would be present after 8000 years? 6. If Nitrogen-14 absorbs an alpha particle and then emits a Hydrogen-1, what is the resulting nucleus?Part 1: Decay Rate graph By READING the R vs t graph shown below, determine R. & the mean life. R (x10¹² decays/s) 12 9. 6. 3. 1 Part 2: Half-life (straightforward determination) 2 60. 40. 3 20. 1 4 A pure sample of a newly discovered radioactive element is discovered. After 8 s, only half of the element remains. What's the half-life of the element? 8s A pure sample of a second newly discovered radioactive element is discovered. After 323 s, only a quarter of the element remains. What's the half-life of the element? 161.5 s ✓ 2 t(s) 5 A pure sample of a third newly discovered radioactive element is discovered. After 453 s, only 1/8 of the element remains. What's the half- life of the element? 151 s Part 3: Half-life graph By READING the N vs t graph shown below, determine N. & the half-life. N (x10¹8 atoms) 80 A pure sample of a fourth newly discovered radioactive element is discovered. After 2736 s, only 1/256 of the element remains. What's the half-life of the element? 342 s 3 4 Ro…Question A6 Potassium has a radioactive isotope, K-40, with a half-life of 1.25 billion years, and a natural abun- dance of 0.012% (120 parts per million). Sea-water contains about 380 ppm of potassium (0.38 grams per litre), essential for life. Calculate the radioactivity of sea-water due to the potassium, giving your answer in Bq m 1. 15 markal
- Why are some radioactive substances dangerous for a very long time? Select one: a. Some radioactive substances have very long half-lives. It takes a long time for the number of radioactive atoms to decrease. b. Some radioactive atoms combine easily with minerals in the ground, so they can't be removed from the environment. c. Some radioactive atoms combine easily with organic molecules. They get into the food chain where they can't be removed. d. Some radioactive molecules are very light, so they stay in the air for long periods of time.3. What is Nuclear Fusion? 4. What is Nuclear Fission?What is the half-life of this radioactive material (Barium 137) in seconds? Now, if we waited 8 half-lives, how many seconds would that be? What fraction of the original material would remain after that time? Explain how you decided on these answers. Don't use Chat GPT I will give you lots of dislikes if you give me Chat GPT answer others skip please. Needs Complete typed solution with complete explanation and 100 % accuracy