You measure the decay rate of a radioactive sample to be 4.225e11 Bq. After 139 s, the decay rate is a quarter the initial rate. a) what is the half-life of the sample? b) how many nuclei were in the sample initially?

You measure the decay rate of a radioactive sample to be 4.225e11 Bq. After 139 s, the decay rate is a quarter the initial rate. a) what is the half-life of the sample? b) how many nuclei were in the sample initially?

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Question

You measure the decay rate of a radioactive sample to be 4.225e11 Bq. After 139 s, the decay rate is a quarter the initial rate.
a) what is the half-life of the sample?

b) how many nuclei were in the sample initially?

Expert Solution