Electronic Principles
An intrinsic semiconductor has some holes in it at room temperature. What causes these holes?

None of these
Valence electrons
Free electrons
Thermal energy
Doping

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Electronic Principles
The total impedance of a parallel RLC circuit:

always increases as the applied frequency increases
None of these
always decreases as the applied frequency increases
is equal to the sum of the values of resistance, inductive reactance and capacitive reactance
is maximum at the resonant frequency

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