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NEET Sample Paper NEET Sample Test Paper-88

  • question_answer
    A soap bubble has radius r and volume V. If the excess pressure inside the bubble is P, then PV is proportional to

    A) \[r\]                  

    B)        \[{{r}^{2}}\]

    C) \[{{r}^{3}}\]               

    D)        \[{{r}^{4}}\]

    Correct Answer: B

    Solution :

    [b] Excess pressure, \[P=\frac{4T}{r}\] \[PV=\frac{4T}{r}\times \frac{4}{3}\pi .{{r}^{3}}=\frac{16T}{3}\pi .{{r}^{2}}\] \[PV\propto {{r}^{2}}\]


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