One thousand small water droplets of equal size combine to form a big drop. Find the ratio of the final surface energy to the initial surface energy of water droplets.

Explanation

`4/3 pi R^2 = 1000 xx 4/3 pi r^3`
`therefore R^3 = 1000r^3`
` therefore` R = 10r`
`E_1 = 1000T (4pir^2)`
`E_2 = T xx 4pi (10r)^2`
`therefore E_2/E = (100r^2)/(1000r^2)` = 1/10