Analog Electronics
An npn BJT has gm=38mA/v, cµ =10¯14 F, cπ =10¯13F and DC current gain β0=90.For this transistor fT & fβ are

fT =1.33 x 1012 Hz & fβ = 1.47 x 1010 Hz
fT =1.64 x 108 Hz & fβ = 1.47 x 1010 Hz
fT =1.47 x 1010 Hz & fβ = 1.33 x 1012 Hz
fT =1.47 x 1010 Hz & fβ = 1.64 x 108 Hz

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

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

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