Consider the following characterizing parameters of a material:1. Magnetic permeability2. Electron relaxation time3. Electron effective mass4. Energy bandgapIn the case of metals, an increase in one of the above parameters decreases its conductivity, while an increase in another increases the conductivity. These are respectively

Consider the following characterizing parameters of a material:1. Magn

1.	Consider the following characterizing parameters of a material:1. Magnetic permeability2. Electron relaxation time3. Electron effective mass4. Energy bandgapIn the case of metals, an increase in one of the above parameters decreases its conductivity, while an increase in another increases the conductivity. These are respectively
A.	1 and 3
B.	3 and 2
C.	4 and 3
D.	1 and 2
Answer» C. 4 and 3

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