Radiation from a point source obeys the inverse square law. If the count rate at a distance of 1.0m from counter is 360 counts per minute. The count rate at the distance of 3m will be:
Correct answer: B. 40 counts per minute
- A. 90 counts per minute
- B. 40 counts per minute
- C. 120 counts per minute
- D. 45 counts per minute
Explanation
The calculations give us 40 counts per minute.
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