PH-2083
Half-life
Physics · Secondary 4 · Medium · Half-life
A radioactive source has a count rate of 520 counts/min at the start. The background count rate is 20 counts/min.
What is the net count recorded from the source after 2 half-lives?
What is the net count recorded from the source after 2 half-lives?
- 70 counts/min
- 125 counts/min
- 145 counts/min
- 260 counts/min
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