A) Both \[{{\sigma }_{1}}\] and \[{{\sigma }_{2}}\] increase
B) \[{{\sigma }_{1}}\] increases and \[{{\sigma }_{2}}\] decreases
C) \[{{\sigma }_{1}}\] decreases and \[{{\sigma }_{2}}\] increases
D) Both \[{{\sigma }_{1}}\] and \[{{\sigma }_{2}}\] decrease
Correct Answer: B
Solution :
Ge is semiconductor and Na is a metal. The conductivity of semiconductor increases and that of the metals decreases with the rise in temperature.
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