© Department of Physics, University of Guelph
1. The count rate 300 cm from a radioactive source is 900 C/min. The detector is moved so that the count rate is 600 C/min. How far is the detector from the source?
2. It is discovered experimentally that all the bs from a particular cource are just absorbed by 5.0 cm of copper (density 9.00 gm/cm3). Would 9.0 cm of zircon (density 4.70 gm/cm3) absorb all the bs from this source?
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