By what factor is the self-inductance of a solenoid changed if only its number of coil turns, N, is doubled?
a. 8
c. 4
b. 1/2
d. 2
C
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A pn-junction is produced by doping silicon that has an energy gap of 1.11 eV with arsenic (Group V) to produce the n-type material, and with boron (Group III) to produce the p-type material.
(a) At temperatures approaching absolute zero, what is the value of the Fermi energy in the n-type and p-type material? (b) At temperatures approaching absolute zero, what would be the value of the contact potential at a pn-junction of these two materials? (c) At temperatures in the intrinsic range of operation for both of these materials, what is the value of the contact potential?
A person throws three rocks off a cliff of height h at exactly the same speed 
, each time, but throwing rock A almost vertically upward, rock B horizontally, and rock C almost vertically downward (see the diagram below). 
Which rock hits the ground with the greatest speed? (Ignore air friction.) A. Rock A B. Rock B C. Rock C D. Rocks A and C hit with the same speed, faster than B. E. All three rocks hit with the same speed.
A space station of diameter 80 m is turning about its axis at a constant rate. If the acceleration of the outer rim of the station is 2.5 m/s2, what is the period of revolution of the space station?
A. 22 s B. 19 s C. 25 s D. 28 s E. 40 s
If a rock sample contains uranium and lead, but no lead-204 is present, then
a. all the lead is radiogenic. b. all the lead is primordial. c. both radiogenic and primordial lead are present. d. neither radiologic nor primordial lead is present.