11th Class Physics Physical World / भौतिक जगत Question Bank 11th CBSE Physics Mathematical Tools, Units & Dimensions

  • question_answer
    The following two graphs represent conductivity as function of temperature. Predict giving reasons, the type of substances which will show these types of curves.                                    (i)                                                          (ii)

    Answer:

    (1)  Graph (i)  Represents variation of conductivity of metals with temperature in which conductivity decreases with increase in temperature because on increasing temperature the movement of positively change kernels also increases which obstructs the flow of electrons.   (2) Graph (ii) Represents variation of conductivity of semiconductors with temperature. Conductivity of semiconductors increases with in crease in temperature since movement of holes as well as electrons becomes faster.    


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