Question: The counting rate from a radioactive source is 8000 counts/s at time t = 0, and 10 min later the rate is 1000 counts/s. (a)

The counting rate from a radioactive source is 8000 counts/s at time t = 0, and 10 min later the rate is 1000 counts/s.

(a) What is the half-life?

(b) What is the decay constant?

(c) What is the counting rate after 20 min?

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