Analog Electronics
The current gain of a bipolar transistor drops at high frequencies because of

The early effect
Transistor capacitances
High current effects in the base
Parasitic inductive elements

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Analog Electronics
The arrowhead on the transistor symbol points in the direction of

  conventional electric current flow in the emitter region.
  minority carrier flow in the emitter region.
  electron flow in the emitter region.
  majority carrier flow in the emitter region.

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