A solar cell has a light-gathering area of 10 cm2 and produces 0.2 A at 0.8 V (DC) when illuminated with S = 1000 W/m2 sunlight. What is the efficiency of the solar cell?
a. 16%
b. 7%
c. 23%
d. 4%
e. 32%
a
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A semiconductor is produced by doping Group IV silicon with 1023 atoms per cubic meter of Group III gallium. Assume that at room temperature this semiconductor is in the extrinsic range of operation.
(a) What type of semiconductor is this? (b) Calculate the room-temperature electrical conductivity of this semiconductor. (c) Clearly state any assumptions you made in calculating the electrical conductivity in part (b).
At what water depth is an ocean wave affected by the ocean floor?
A) It depends on the wave's angle of approach to the shoreline. B) The ocean floor has no impact on ocean waves. C) At the depth equal to one-half the wave's wavelength. D) At the depth where transverse motion dominates.
The actual source of wind energy is
A. the daily rotation of the Earth on its axis. B. the tides. C. the lunar cycle. D. solar energy.
(Do not try the following: it could kill you. This question is only about a hypothetical possibility.) If you were standing below an object emitting a fixed frequency sound falling at terminal velocity, as it approached you, you would hear the sound
a. drop in frequency. b. stay at the same frequency. c. increase in frequency. d. decrease in loudness. e. stay at the same loudness.