Asubstancediffusesininnitespacewithinitialconcentration(r)
Chapter 10, Problem 12(choose chapter or problem)
Asubstancediffusesininnitespacewithinitialconcentration(r)=1 forr < a, and (r)=0 forr > a. Find a formula for the concentration at later times. (Hint: It is radial. You can substitute v = ru to get a problem on a half-line.)
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