Beta () or amplification factor
The ratio of dc collector current (IC) to the dc base current (IB) is dc beta (dc ) which is dc current gain where IC and IB are determined at a particular operating point, Q-point (quiescent point).
It’s define by the following equation:
30 < dc < 300 2N3904
On data sheet, dc=hFE with h is derived from ac hybrid equivalent cct. FE are derived from forward-current amplification and common-emitter configuration respectively.