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

  • question_answer
    A drop of liquid of diameter 2.8 mm breaks up into 125 identical drops. The change in energy is nearly (S.T. of liquid =75 dynes/cm)                           [CPMT 1989]

    A) Zero    

    B)              19 erg

    C)             46 erg 

    D)              74 erg

    Correct Answer: D

    Solution :

                    \[E=4\pi {{R}^{2}}T({{n}^{1/3}}-1)\] = \[4\times 3.14\times {{(1.4\times {{10}^{-1}})}^{2}}\times 75({{125}^{1/3}}-1)\]\[=74\ erg\]


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