PH-2093
Half-life
Physics · Secondary 4 · Hard · Half-life
A radioactive source has an initial count rate of 320 counts per minute. After 12 minutes, the count rate has fallen to 40 counts per minute. Assuming the source follows the law of radioactive decay, what is the half-life of the source?
- 2 minutes
- 3 minutes
- 4 minutes
- 6 minutes
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