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Worksheet: Semiconductors


The base current of a transistor is 5.6 mA and its current gain is 1 146. What is the collector current?


The collector current of a transistor is 4.6 A for a base current of 5.4 mA. What is the current gain?


What is the longest possible wavelength of a photon that can excite a valence electron into the conduction band across an energy gap of 0.70 eV?


A valence electron in a crystal absorbs a photon of wavelength 0.300 nm. The energy from this photon is just enough energy to allow the electron to jump from the valence band to the conduction band. What is the magnitude of the energy gap?