1.

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 _____

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.


Discussion

No Comment Found

Related InterviewSolutions