Which of the following terms is given to a pair of stars that we can determine are orbiting each other only by measuring their periodic Doppler shifts?
A) visual binary
B) eclipsing binary
C) spectroscopic binary
D) double star
E) none of the above
C
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Collisions between galaxies are thought to
A) be commonplace. B) have stopped about 5 billion years ago. C) be extremely rare. D) have never occurred. E) have only occurred between 10 and 15 billion years ago.
The Doppler shift is used to find
A) astrometric binaries. B) spectroscopic binaries. C) photometric binaries. D) visual binaries. E) eclipsing binaries.
A convex mirror with focal length of -20 cm forms an image 15 cm behind the surface. Where is the object located as measured from the surface?
a. 30 cm c. 15 cm b. 7.5 cm d. 60 cm
The power rating of a resistor is 0.800 W. If the value of the resistor is 400 ?, what is the maximum voltage?
A) 110 V B) 17.9 V C) 170 V D) 1.80 V