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A spherical rain drop evaporates at a rateproportional to its surface area at any instant `tdot`Thedifferential equation giving the rate of change of the radius of the raindrop is _____ |
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Answer» Correct Answer - `((dr)/dt=-lambda)` Since, Rate of change of volume `propto` surface area `rArr (dV)/dt propto SA` `rArr 4pir^(2)cdot (dr)/dt=-lambda4pir^(2)` `(dr)/dt=-lambda` is required differential equation. |
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