PH-2079
Half-life
Physics · Secondary 4 · Hard · Half-life
A radioactive tracer used in medicine has a half-life of 4.0 hours. A detector placed near the patient initially records 1200 counts per minute from the tracer (background already subtracted). What will the count rate be 8.0 hours later?
- 300 counts per minute
- 150 counts per minute
- 600 counts per minute
- 75 counts per minute
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