PH-2078
Half-life
Physics · Secondary 4 · Hard · Half-life
A radioactive source gives a count rate of 480 counts per minute. After 18 minutes, the count rate has fallen to 60 counts per minute. Assuming a constant half-life and negligible background, what is the half-life of the source?
- 6 minutes
- 3 minutes
- 9 minutes
- 12 minutes
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