kbritt6251 kbritt6251
  • 29-01-2024
  • Physics
contestada

How long will it take for 475 mg of a sample of radium-225, which has a half-life of about 15 days, to decay to 30 mg?
a) 60 days
b) 50 days
c) 58 days
d) 52 days

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