The temperature dependence of resistance of Cu and undoped Si in the temperature range `300 -400 K, ` is best described by :

Options

A. linear increase for Cu, linear for `Si`
B. linear increase for Cu, exponential increase for `Si`
C. linear increase for Cu, exponential decrease for `Si`
D. linear decrease for Cu, linear decrease for `Si`

Answer

c

Explanation

As `Cu` conductor and the temperature coefficient of resistance is position in its resistance increase with increase in temperature. `Si` is a semiconductor and its temperature coefficient of resistance is negative its resistance will decrease exponentially with the increase in temperature