Semiconductors: A simple junction transistor consists of three semiconductor sections consisting of
A. only pnp semiconductors.
B. only npn semiconductors.
C. either pnp or npn semiconductors.
D. none of the given combinations.
Answer: C
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In the field, you find an unidentified mineral that is clear, exhibits conchoidal fracture, and can scratch glass. This mineral is most likely:
-gypsum. -calcite. -quartz. -hornblende. -muscovite.
A solid aluminum cube rests on a wooden table in a region where a uniform external electric field is directed straight upward. What can we say concerning the charge on the top surface of the cube?
A) The top surface is neutral. B) The top surface is charged negatively. C) The top surface is charged positively. D) The top surface's charge cannot be determined without further information.
The reason that we can calculate the change in entropy of a system is that
a. entropy always decreases. b. entropy always increases. c. the entropy of the universe always remains constant. d. it depends only on the properties of the initial and final equilibrium states. e. systems always follow reversible paths.
Which of the following statements is not true about wave packets and their use in describing particles?