PH-2101
Half-life
Physics · Secondary 4 · Hard · Half-life
A radioactive source has an initial count rate of 320 counts per minute. After 6.0 hours, the count rate has fallen to 40 counts per minute. Assuming the source decays with a constant half-life, what is the half-life of the source?
- 1.0 hour
- 1.5 hours
- 2.0 hours
- 3.0 hours
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