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NEET Sample Paper NEET Sample Test Paper-46

  • question_answer
    A soap bubble of radius r is blown upto form a bubble of radius 2r under isothermal conditions. If T is the surface tension of soap solution, the energy spent in the blowing is -

    A) \[3\pi T{{r}^{2}}\,joule\]

    B)                    \[6\pi T{{r}^{2}}\,joule\]

    C)                    \[12\pi T{{r}^{2}}\,joule\]

    D)                    \[24\pi T{{r}^{2}}\,joule\]

    Correct Answer: D

    Solution :

    \[\Delta U\,\,=\,\,2\,[4\pi {{(2r)}^{2}}-4{{\pi }^{2}}]\] \[=\,\,\,24\pi {{r}^{2}}T\]


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