About how many days are required for a radioactive sample,with an initial activity of 10⁵ Bq,to decay to an activity of 100 Bq? The half-life of the material is 4.5 days.

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Quizplus · Accepted Answer

The activity decreases by half every 4.5 days. To go from 10^5 Bq to 100 Bq, the activity must halve 10 times (since 10^5 to 10^2 is a factor of 10^3, which is 2^10). Therefore, 4.5 days x 10 = 45 days.

About How Many Days Are Required for a Radioactive Sample,with