Atomic Structure Techniques. PHYSICS LATEST PAPER. Predictor questions QUESTIONS

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Describe the structure of the nucleus of the isotope shown below. 227 Ac 89 2. Complete the decay equation, showing an isotope decaying via alpha decay into an unknown element, X. 221 Pa  ... ….. X + ….. ……… 91 ….. ….. 3. Complete the decay equation, showing an isotope decaying via beta decay into an unknown element, X. 34 P  ….. X + ….. ……… 15 ….. ….. 4. Determine the half-life of a radioactive source which decreases from an activity of 160 Bq to 20 Bq in 48 years. 5. Determine the fraction of a radioactive source which has decayed after 24 hours, if the source has a half-life of 12 hours 7. Explain which of the isotopes in the table would be the best choice for use as: Isotope Half-life Emission (a) a radioactive medical tracer (b) a source in a radiotherapy machine A 4 hours α B 2 years β C 10 days β γ D 20 minutes γ E 4 years α β γ 8. Use the graph to accurately determine the half-life of the radioactive source. Activity /Bq 40 80 120 160 200 240 280 320 360 Time /hours 9. Describe and explain how the model of the atom has changed over time. You may use diagrams as part of your answer [Show More]

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