PH-692
Background radiation
Physics · Secondary 3 · Hard · Background radiation
A Geiger–Müller tube is left running without any radioactive source nearby. In five separate 1-minute intervals, it records 12, 14, 11, 13 and 10 counts. What is the best estimate of the background count rate?
- 10 counts per minute
- 12 counts per minute
- 60 counts per minute
- 5 counts per minute
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