PH-2099
Half-life
Physics · Secondary 4 · Medium · Half-life
A student measures the count rate from a radioactive source every 5 minutes. The readings (already corrected for background) are 400, 200 and 100 counts per minute at 0, 5 and 10 minutes respectively. What is the half-life of the source?
- 2.5 minutes
- 5 minutes
- 10 minutes
- 15 minutes
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