Worksheet: Semiconductors

In this worksheet, we will practice describing the energy bands of insulators, conductors, and semiconductors and finding the energy changes of band transitions.

Q1:

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?

Q2:

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

Q3:

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?

Q4:

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

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