Question: A radioactive silver foil (t 1/2 = 2.4 min) is placed near a Geiger counter and 1000 counts/s are observed at time t = 0.

A radioactive silver foil (t1/2 = 2.4 min) is placed near a Geiger counter and 1000 counts/s are observed at time t = 0.

(a) What is the counting rate at t = 2.4 min and at t = 4.8 min?

(b) If the counting efficiency is 20%, how many radioactive nuclei are there at time t = 0? At time t = 2.4 min?

(c) At what time will the counting rate be about 30 counts/s?

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