What is the beta of a bipolar junction transistor?
The frequency at which the current gain is reduced to 0.707
The change in collector current with respect to the change in base current✓Bonne réponse
The breakdown voltage of the base-to-collector junction
The switching speed
Explication
Beta is the common-emitter current gain of the transistor: the ratio of a change in collector current to the change in base current that caused it, β = ΔIC / ΔIB. The other choices name a cutoff frequency, a junction breakdown rating, and switching speed — all genuine transistor parameters, none of them beta.