The ________-year solar cycle is characterized by a variation in the number of sunspots through a reversal of the magnetic polarity of the Sun as a whole
A) 2 B) 10 C) 11 D) 22 E) 44
D
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If a star is found by spectroscopic observations to be about 500 parsecs distant, its parallax is
A) .2". B) .5". C) .02". D) .002". E) .005".
Three resistors, each of different value, are used in a circuit with a power source supplying 12 volts. For which of the following resistor combinations is the total power supplied the greatest?
a. This cannot be found until it is known which resistor is in series with the parallel pair. b. all three resistors in series c. two of the resistors in parallel with the third resistor in series with the parallel pair d. all three resistors in parallel
Diagram 7-1 shows a plot of the temperature of the Sun as a function of distance above the bottom of the photosphere. At what distance above the bottom of the photosphere is the temperature of the Sun the smallest?
Carol is stationary midway between two light bulbs and observes that they turn on at the exact same time. You are moving near the speed of light toward the light bulb to Carol's left. What do you observe?
A) You observe the light bulb to the left turns on first. B) You observe the light bulb to the right turns on first. C) You observe the light bulbs turn on at the same time, like Carol. D) The order of the events depends on how fast you are moving.