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In an experiment, the resistance of a material is plotted as a function of temperature (in some range). As shown in the figure, it is a straight line. 1/T 2 ln R(T) One may conclude that :

1. 2 0 2 T / T 0 e R ) T ( R =
2. R(T) = 2 0 T R
3. 2 0 2 T / T – 0 e R ) T ( R =
4. 2 2 0 T / T – 0 e R ) T ( R =

Correct answer: 2 2 0 T / T – 0 e R ) T ( R =

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