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 Form 4 Chemistry: Radioactivity Questions and Answers

A radioactive substance weighing M kg took 1900 years for the original mass to reduce to 15 kg. Given that the half life of the radioactive substance is 380 years;
(a) Determine the original mass of the radioactive substance.
(b) State two uses of radioactivity in medicine.

 (3m 3s)
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