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JEE Main & Advanced Physics Thermometry, Calorimetry & Thermal Expansion Question Bank Thermal Expansion

  • question_answer
    The volume of a gas at 20°C is 100 cm3 at normal pressure. If it is heated to 100°C, its volume becomes 125 cm3 at the same pressure, then volume coefficient of the gas at normal pressure is                               [Pb. PET 2002; DPMT 2001]

    A)            0.0015/°C                               

    B)            0.0045/°C

    C)            0.0025/°C                               

    D)            0.0033/°C

    Correct Answer: D

    Solution :

    \[\frac{{{V}_{1}}}{{{V}_{2}}}=\frac{1+\gamma \,{{t}_{1}}}{1+\gamma \,{{t}_{2}}}\] Þ \[\frac{100}{125}=\frac{1+\gamma \times 20}{1+\gamma \times 100}\] Þ g = 0.0033/°C


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