The Fermi energy of a metal at a temperature T is 7.0 eV. What is the average energy (in eV) of a conduction electron at that temperature?
a. 2.8
b. 7.0
c. 3.5
d. 4.2
e. 4.7
[Ques. 2] Suppose you start at Washington, D.C. (39N, 77W), and travel 400 nautical miles due south, then 400 nautical miles due east, then 400 nautical miles due north, and then 400 nautical miles due west. Where will you arrive with respect to Washington, D.C.? That is will you be at the starting point, or north, south, east, or west of the starting point?
[Ques. 3] The region of the electromagnetic spectrum with frequencies just less than those in the visible region is the ______________ region.
a. infrared
b. gamma rays
c. radio waves
d. microwaves
e. x-rays
[Ques. 4] The Fermi temperature of copper is 80 000 K. The corresponding Fermi energy (in eV) is
a. 7
b. 5
c. 3
d. 1
e. 4
[Ques. 5] What are the latitude and longitude of a place on Earth directly opposite Columbia, South Carolina, which is at 81W, 34N?
[Ques. 6] The region of the electromagnetic spectrum with wavelengths just greater than those in the infrared region is the ______________ region.
a. microwaves
b. x-rays
c. gamma rays
d. radio waves
e. ultraviolet
[Ques. 7] The Fermi temperature is
a. a characteristic temperature of an electron gas at a physical temperature of absolute zero.
b. a characteristic temperature of an electron gas at a physical temperature of 0 Celsius.
c. the temperature of the electron gas in absolute degrees.
d. related to the Fermi energy by the relation EF = (3/2) kT.
e. independent of the Fermi energy.
[Ques. 8] Which two of the following places are nearest to each other? Place A at latitude 20N, longitude 90W Place B at latitude 30N, longitude 90W Place C at latitude 30N, longitude 75W Place D at latitude 20N, longitude 75W
[Ques. 9] Light waves travel fastest in
a. water.
b. glass.
c. a vacuum.
d. air.
e. none of these; they travel at the same speed in all these media.
[Ques. 10] The Fermi energy corresponds to
a. the maximum energy electrons can have in a metal at T = 0 K.
b. the maximum energy electrons can have in a metal at T = 0 C.
c. the minimum energy electrons can have in a metal at T = 0 K.
d. the number of electrons per unit volume between E and E + dE.
e. the minimum energy electrons can have in a metal at T = 0 C.
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