Question: A sphere 3 2 . 5 mm in diameter is placed inside a chamber containing a radioactive aerosol of 0 . 1 - m diameter

A sphere 32.5 mm in diameter is placed inside a chamber containing a radioactive aerosol of 0.1-m diameter particles for 5 min . The sphere is removed, and the number of particles attached to its surface is determined by radioactive counting to be 8107. What is the number concentration of particles in the chamber?
A sphere 3 2 . 5 mm in diameter is placed inside

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