Exam 41: Conduction of Electricity in Solids

The energy level diagram shown applies to:

For a pure semiconductor at room temperature the temperature coefficient of resistivity is determined primarily by:

A light emitting diode emits light when:

The density of states for a metal depends primarily on:

The energy gap between the valence and conduction bands of an insulator is of the order:

A sinusoidal potential difference V_in = V_msin( $\omega$ t)is applied to the p-n junction as shown.Which graph correctly shows V_out as a function of time?

The occupancy probability for a state with energy equal to the Fermi energy is:

At T = 0 K the probability that a state 0.50 eV below the Fermi level is occupied is:

The energy level diagram shown applies to:

Electrons in a full band do not contribute to the current when an electric field exists in a solid because:

Which one of the following statements concerning electron energy bands in solids is true?

"LED" stands for:

At room temperature, kT is about 0.0259 eV.The probability that a state 0.50 eV above the Fermi level is occupied at room temperature is:

In a metal at 0 K, the Fermi energy is:

A certain material has a resistivity of 7.8 *10³ $\Omega$ .m at room temperature, and its resistivity decreases as the temperature is raised by 100 $\degree$ C.The material is most likely:

Acceptor atoms introduced into a pure semiconductor at room temperature:

At T = 0 K the probability that a state 0.50 eV above the Fermi level is occupied is:

Possible units for the density of states function N(E)are:

The contact electric field in the depletion region of a p-n junction is produced by:

In an unbiased p-n junction: