Chemistry, 07.10.2019 22:20, coontcakes

Asample of a material has 200 radioactive particles in it today. your grandfather measured 400 radioactive particles in it 90 years ago.

a) 90 years from today, how many radioactive particles will the sample have?

b) 180 years from today, how many radioactive particles will the sample have?

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Asample of a material has 200 radioactive particles in it today. your grandfather measured 400 radio...