J & K CET Medical J & K - CET Medical Solved Paper-2001

  • question_answer
    A number of small drops coalesce together to form a single drop. The temperature of new drop:

    A)  increases

    B)  decreases

    C)  remains unchanged

    D)  may increase or decrease depends on size

    Correct Answer: A

    Solution :

                    The influence of temperature on surface tension\[(\gamma )\]is given by \[_{\gamma }{{V}^{2/3}}=k({{T}_{C}}-T)\]where V is molar volume of that substance,\[{{T}_{C}}\] is critical temperature, k is constant. Since, temperature is directly proportional to\[{{V}^{2/3}}\]. Since, volume of big drop increases its temperature also increases.


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