PH-2115
Half-life
Physics · Secondary 4 · Medium · Half-life
A radioactive isotope has a half-life of 5 days. The initial count rate from a sample is 3200 counts/min. What is the count rate from the sample after 10 days? Ignore background radiation.
- 800 counts/min
- 1600 counts/min
- 6400 counts/min
- 400 counts/min
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