PH-2085
Half-life
Physics · Secondary 4 · Hard · Half-life
A radioactive source has a half-life of 4.0 days. Its activity is 800 counts per minute at the start of an experiment. Assuming no background radiation, what will the activity be after 8.0 days?
- 100 counts per minute
- 200 counts per minute
- 400 counts per minute
- 800 counts per minute
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