PH-2076
Half-life
Physics · Secondary 4 · Hard · Half-life
A radioactive isotope has a half-life of 5.0 days. The initial count rate from the source is 3200 counts per minute. Assuming the background count rate is negligible, what is the count rate after 10 days?
- 800 counts per minute
- 400 counts per minute
- 1600 counts per minute
- 6400 counts per minute
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