A gas is placed in a thermally insulated container as shown below
As the piston is slowly raised...
1.... the gas gives off heat to the environment (Q<0).
2.... the gas absorbs heat from the environment (Q>0).
3.... the gas does not exchange any heat with the environment (Q=0).
4.The heat exchanged with the environment cannot be determined.
3
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It is desired to produce a p-type semiconductor out of Group IV silicon that will have an electrical conductivity of 100 (?·m)-1 at room temperature. Assume that the mobility of electrons in silicon is equal to 0.10 m2 /V·s, and the mobility of holes is equal to 0.03 m2 /V·s. You may assume that this semiconductor is in the extrinsic range of operation at this temperature.
(a) What is the required density of holes in the valence band? (b) What concentration of substitutional acceptor atoms will produce the desired electrical conductivity, assuming that an element from Group III is substituted for the silicon atoms?
Which of the following is NOT one of the normal types of galaxies?
A) Normal spirals B) Barrel spirals C) Seyfert spirals D) Irregular type II E) Dwarf ellipticals
A motorist travels for 3.0 h at 80 km/h and 4.0 h at 60 km/h. What is her average speed for the trip?
A) 74 km/h B) 140 km/h C) 70 km/h D) 73 km/h E) 69 km/h
Wave frequency is inversely proportional to
a. amplitude. b. period. c. wave velocity. d. all of these.