• # question_answer In $''Al''$ and $''Si''$. If temperature is changed from normal temperature to 70 K then A)  The resistance of $Al$ will increase and that of $Si$ will decreaseB)  The resistance of $Al$ will decrease and that of $Si$ will increaseC)  Resistance of both decreaseD)  Resistnance of both increase

$T\downarrow$ ($300K$ to $70K$) $T\downarrow \underset{(Al)}{\mathop{{{R}_{metal}}}}\,\downarrow \underset{(Si)}{\mathop{R}}\,\uparrow$semi - conductor