PH-2103
Half-life
Physics · Secondary 4 · Hard · Half-life
A sample of a radioactive isotope has an activity of 640 counts per minute. The half-life of the isotope is 3.0 hours. What will the activity be after 6.0 hours?
- 80 counts per minute
- 160 counts per minute
- 320 counts per minute
- 480 counts per minute
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