At a distance of 9 cm from a presumably isotropic, radioactive source, a pair of

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AHHHHHHHHHPhysics

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students measure 51 cps (cps? At a distance of 9 cm from a presumably isotropic, radioactive source, a pair of students measure 51 cps (cps = counts per second). On average, how many counts per second do you expect at a distance of 29 cm? (Note that the average number of counts per second need not be an integer.)
 
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