PH-2097
Half-life
Physics · Secondary 4 · Hard · Half-life
A sample of a radioactive isotope has an activity of 640 counts per minute. After 12 minutes, the activity has fallen to 80 counts per minute. Assuming no background radiation, what is the half-life of the isotope?
- 2.0 minutes
- 3.0 minutes
- 4.0 minutes
- 6.0 minutes
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