1.

A mercury drop of radius 1 cm is sprayed into `10^(6)` drops of equal size. The energy expended in joule is (surface tension of mercury is `(460xx10^(-3)N//m)`A. `5.7`B. `5.7 xx 10^(-4)`C. `0.057`D. `5.7 xx 10^(-6)`

Answer» Correct Answer - C
dE `= 4piR^(2)T (n^(1//3)-1)`
` = 12 .56 xx 10^(-4) xx 46 xx10^(-2) xx 99 = 0.057`


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