Question: A sample of radioactive material is initially found to have an activity of 115.0 decays/min. After 4 d 5 h, its activity is measured to

A sample of radioactive material is initially found to have an activity of 115.0 decays/min. After 4 d 5 h, its activity is measured to be 73.5 decays/min.

(a) Calculate the half-life of the material.

(b) How long (from the initial time) will it take for the sample to reach an activity level of 10.0 decays/min?

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