JEE Main & Advanced Physics Fluid Mechanics, Surface Tension & Viscosity / द्रव यांत्रिकी, भूतल तनाव और चिपचिपापन Question Bank Surface Energy

  • question_answer
    8 mercury drops coalesce to form one mercury drop, the energy changes by a factor of                       [DCE 2000]

    A) 1         

    B)             2

    C)             4

    D)             6

    Correct Answer: C

    Solution :

                    As volume remains constant therefore \[R={{n}^{1/3}}r\]             \[\frac{\text{Energy of big drop}}{\text{Energy of small drop}}=\frac{4\pi {{R}^{2}}T}{4\pi {{r}^{2}}T}=\frac{{{R}^{2}}}{{{r}^{2}}}\]\[={{(8)}^{2/3}}=4\]


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