Question: 1 ) Radium 2 2 1 has a half life of 3 0 seconds. a ) Find an equation that represents the weight of Radium

1) Radium 221 has a half life of 30 seconds. a) Find an equation that represents the weight of Radium 221 after t seconds. b) How long will it take for 99% of a sample of Radium 221 to decay?

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