Semiconductors: When a voltage is applied across a p-type semiconductor, the holes
A. are destroyed.
B. move toward the positive electrode.
C. move toward the negative electrode.
D. do not move.
Answer: C
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The bob of a conical pendulum swings in a
A) to-and-fro path. B) circular path. C) chaotic path.
While observing the Sun, you note a large number of sunspots. What can you conclude?
A) The Sun is less luminous than usual. B) This is a period of low solar activity. C) Earth's climate will be unusually cold. D) The Sun's rotation is slower than average. E) There are likely to be an above average number of flares and prominences.
According to the theory of cosmic inflation, at what time in the history of the universe did inflation occur?
A) at the very beginning of the big bang B) at the time that the cosmic background radiation formed C) around the third or fourth minute D) around the third or fourth second E) at a tiny fraction of the first second, but not quite at the very beginning of the big bang
A vessel containing 10 kg of water is left out where it evaporates. If the temperature remains constant at 20°C, what is the change in entropy (in kcal/K)? (The latent heat of vaporization at 20°C is 585 cal/g.)
a. 30 b. 10 c. 20 d. 40 e. 290