Questions from Modern Physics

Q: Silver has a Fermi energy of 5.48 eV. Calculate

Silver has a Fermi energy of 5.48 eV. Calculate the electron contribution to the molar heat capacity at constant volume of silver, CV, at 300 K. Express your result a. as a multiple of R and b. as a...

Q: At the Fermi temperature TF, EF = kTF (see Exercise

At the Fermi temperature TF, EF = kTF (see Exercise 42.22). When T = TF, what is the probability that a state with energy E = 2EF is occupied?

Q: For a solid metal having a Fermi energy of 8.500

For a solid metal having a Fermi energy of 8.500 eV, what is the probability, at room temperature, that a state having an energy of 8.520 eV is occupied by an electron?

Q: Pure germanium has a band gap of 0.67 eV.

Pure germanium has a band gap of 0.67 eV. The Fermi energy is in the middle of the gap. a. For temperatures of 250 K, 300 K, and 350 K, calculate the probability f(E) that a state at the bottom of th...

Q: Germanium has a band gap of 0.67 eV. Doping

Germanium has a band gap of 0.67 eV. Doping with arsenic adds donor levels in the gap 0.01 eV below the bottom of the conduction band. At a temperature of 300 K, the probability is 4.4 * 10-4 that an...

Q: a. Suppose a piece of very pure germanium is to be

a. Suppose a piece of very pure germanium is to be used as a light detector by observing, through the absorption of photons, the increase in conductivity resulting from generation of electron–hole pai...

Q: At a temperature of 290 K, a certain p-n

At a temperature of 290 K, a certain p-n junction has a saturation current IS = 0.500 mA. a. Find the current at this temperature when the voltage is i. 1.00 mV, ii. -1.00 mV, iii. 100 mV, and i...

Q: For the H2 molecule the equilibrium spacing of the two protons is

For the H2 molecule the equilibrium spacing of the two protons is 0.074 nm. The mass of a hydrogen atom is 1.67 * 10-27 kg. Calculate the wavelength of the photon emitted in the rotational transition...

Q: The central-field approximation is more accurate for alkali metals than

The central-field approximation is more accurate for alkali metals than for transition metals such as iron, nickel, or copper. Why?

Q: For a certain p-n junction diode, the saturation current

For a certain p-n junction diode, the saturation current at room temperature (20°C) is 0.950 mA. What is the resistance of this diode when the voltage across it is a. 85.0 mV and b. -50.0 mV ?