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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 11.4e12 5 6 mean life = 12 s 7 8 9 10 t(h) decays/s x No=64e18 half-life = 12 s atoms X
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Transcribed Image Text: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 11.4e12 5 6 mean life = 12 s 7 8 9 10 t(h) decays/s x No=64e18 half-life = 12 s atoms X
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