MHT CET 2023 Mathematics question
A spherical raindrop evaporates at a rate proportional to its surface area. If originally its radius is 3mm and 1 hour later it reduces to 2 mm, then the expression for the radius R of the raindrop at any time t is
Answer: (B)
Solution
Data: at and at . Strictly, if the volume decreases at a rate proportional to the surface area, , which gives (not among the options). The options must therefore be tested
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