Question: On a surface step of height h , the upper corner has a positive radius of rand the lower corner has a negative radius of

On a surface step of height h, the upper corner has a positive radius of rand the lower corner has a negative radius of r. On annealing at temperature T, surface diffusion occurs and it transports matter from the upper corner to the lower corner, resulting in a round-off of the corners. Assume surface diffusivity is D, calculate the time it takes to change the radius from r to h/2

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