PH-2104
Half-life
Physics · Secondary 4 · Hard · Half-life
A radioactive sample has a count rate of 96 counts per minute. After 9.0 minutes, the count rate has decreased to 12 counts per minute. Assuming exponential decay, what is the half-life of the sample?
- 1.5 minutes
- 2.0 minutes
- 3.0 minutes
- 4.5 minutes
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