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10. [4 marks] Radioactive elements decay at rates that are proportional to the amount of the element present. The isotope cobalt-60 is used in treating

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10. [4 marks] Radioactive elements decay at rates that are proportional to the amount of the element present. The isotope cobalt-60 is used in treating cancerous tumours. The half-life of this isotope is 5.27 years. What percent of an initial amount remains after 2 years

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