Analog Electronics
The amount of time between the creation and disappearance of a free electrons is called

 recombination
 life time of the carriers
 drift velocity
 bound electrons

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Analog Electronics
In all base driver amplifiers

ac collector voltage is 180° out of phase with ac base voltage
ac emitter voltage is 180° out of phase with ac base voltage
None of these
ac collector voltage is in phase with ac base voltage

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