Question: a sample of a material has 2 0 0 0 0 radioactive particles in it today. your great - grandmother measured 4 0 0 0

a sample of a material has 20000 radioactive particles in it today. your great-grandmother measured 40000 radioactive particles in it 100 years ago. How many radioactive particles will the sample have 100 years from today? How many radioactive particles will the sample have 200 years from today?

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