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

  • question_answer
    A big drop of radius R is formed by 1000 small droplets of water, then the radius of small drop is [AFMC 1998; Pb. PMT 2000]

    A) R/2      

    B)             R/5

    C)             R/6      

    D)             R/10

    Correct Answer: D

    Solution :

                    \[\frac{4}{3}\pi {{R}^{3}}=1000\times \frac{4}{3}\pi {{r}^{3}}\] (As volume remains constant)             \[{{R}^{3}}=1000{{r}^{3}}\]Þ \[R=10r\Rightarrow r=\frac{R}{10}\]


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