PH-2106
Half-life
Physics · Secondary 4 · Medium · Half-life
A sample of a radioactive isotope has a count rate of 3200 counts/min. The half-life of the isotope is 6.0 hours. What will be the count rate after 12 hours? (Ignore background radiation.)
- 400 counts/min
- 800 counts/min
- 1600 counts/min
- 6400 counts/min
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