JEE Main & Advanced Sample Paper JEE Main Sample Paper-29

  • question_answer
    One thousand small water drops of equal radii ^ combine to form a big drop. The ratio of final surface energy to the total initial surface energy.

    A) \[1000:1\]                           

    B) \[1:1000\]

    C) \[10:1\]                               

    D) \[1:10\]

    Correct Answer: D

    Solution :

    Surface energy of drop = product of surface area and surface of the liquid Required ratio = Final surface energy/Total initial surface energy Total initial mass of drops = Final mass of the drop Total initial volume = Final volume because density is same.


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