If an electric field is applied to a metal
a. very few electrons are excited into the conduction band.
b. electrons having energies near the Fermi energy require only a small amount of additional energy from the applied field to reach nearby empty energy states.
c. electrons having energies near the bottom of the band require only a small amount of additional energy from the applied field to reach nearby empty energy states.
d. the principal mode of conduction is through the motion of holes in the filled part of the band.
e. the Fermi energy Ef becomes equal to the applied electric field E.
b
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Laplace's nebular hypothesis was problematic in that he could not explain ____
a. the different types of planets b. the rotational direction of the planets c. how the Sun had <0.5% of the Solar System's angular momentum d. how one star could come within a close encounter of another star e. how gravity was the dominant force of planet formation
Conversion of Units: The Hope Diamond weighs 44.5 carats, and there are 200 mg per carat. What is the mass of the Hope Diamond in kilograms?
A. 0.000890 kg B. 0.00890 kg C. 0.0890 kg D. 0.890 kg E. 8.90 kg
A mass attached to a spring vibrates back and forth. At maximum displacement,
A) velocity reaches zero. B) acceleration reaches a maximum. C) net force reaches a maximum. D) velocity reaches a maximum.
A rock attached to a string swings in a vertical circle. Which free-body diagram could correctly describe the force(s) on the rock when the string is in one possible horizontal position, where 
is the normal force, 
is weight, and
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B.
C.
D.
E.
