When a voltage is applied across a p-type semiconductor, the holes
A) are destroyed. B) move toward the negative electrode.
C) do not move. D) move toward the positive electrode.
B
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Intensity: About 1350 W/m2 of electromagnetic energy reaches the upper atmosphere of the earth from the sun, which is 1.5 × 1011 m away. Use this information to estimate the average power output of the sun.
A. 1 × 1026 W B. 2 × 1026 W C. 3 × 1026 W D. 4 × 1026 W
Which of the following best describes the geological histories of the Moon and Mercury?
A) Early in their histories, they suffered many impacts and experienced some volcanism and tectonics, but they now have little geological activity at all. B) Impact cratering is the only major geological process that has affected their surfaces. C) All four geological processes were important in their early histories, but only tectonics still reshapes their surfaces today. D) Impact cratering shaped these worlds early in their histories. Then, during the past few million years, they were reshaped by episodes of volcanism and tectonics.
Given the distance x that a spring is compressed, what is the potential energy of the spring?
A. 2 kx^2 B. ½ kx C. ½ kx^2 D. 2 kx
The first person to claim to see linear features on the surface of Mars was
A) Angelo Secchi B) Percival Lowell C) Giovanni Schiaparelli D) William Herschel