Consider a drug being delivered as a solid cylinder. The initial diameter of the

Question

Consider a drug being delivered as a solid cylinder. The initial diameter of the cylinder is 4 mm and a length of 10 mm (1 cm). As the cylinder dissolves, the drug is released into the surrounding environment. You can assume that the length of the cylinder remains constant over time. You can also assume that the di?usion of the drug is ONLY along the radial direction (and that the length, L of the cylinder remains constant. The di?usivity of the drug in the surrounding medium is 1.5x10? 9 m^2/sec and the solubility of the drug in the medium is 3.0x10? 4 grams/cm^3 (you can take this as Cs or surface concentration of the drug). The density of the drug/cylinder is 5.0 grams/cm3

At what time will the drug have lost 50 % of the initial volume?

You may need this equation:         

Explanation / Answer

can you be explain question via diagram sorry to bother you bt i was unable to follow

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