According to current theories, how did the sun's planets get here?
A) Stars such as the sun, and planets such as those around the sun, all formed shortly after the big bang, and then gathered into "solar systems" such as we see today.
B) Part of the gas and dust that gathered together to form the sun went into orbit around the sun instead of falling into the sun, and this part formed the planets.
C) The sun was originally part of the two-star system, the second star split up into pieces, and these pieces developed into the planets.
D) A passing star tore off part of the sun, and this part separated into pieces to form the planets.
E) After the sun had formed, it gathered fully-formed planets from various places as the sun moved through the galaxy.
B
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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?
Graphical Addition: Consider two vectors 
and 
shown in the figure. The difference 
-
is best illustrated by
A. choice (a) B. choice (b) C. choice (c) D. choice (d)
Tensile Stress and Strain: Tensile strain is
A. the ratio of the change in length to the original length. B. the stress per unit area. C. the applied force per unit area. D. the ratio of stress to elastic modulus.
The parallactic angle is the total shift observed over a six-month interval
Indicate whether the statement is true or false