The Sun's life time is 10 billion years. About how long is the lifetime of a star with a star has a mass of 0.1 MSun and a luminosity of 0.01 LSun?
A) 1 billion years
B) 100 million years
C) 100 billion years
D) 10 million years
C) 100 billion years
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Why do astronomers believe supermassive black holes are the source of an AGN's energy?
a. Such black holes have been found at the center of most galaxies, both active and inactive. b. Radio jets are seen from low-mass black holes plus accretion disks inside our galaxy. c. Jets and accretion disks have been observed in active galaxies. d. Black holes can produce so much energy in such a small place. e. All of the other choices are correct.
What is the surface temperature of a star, given that its radiation peak occurs at a frequency of 1.06 × 1015 Hz?
A) 17,000 K B) 14,500 K C) 19,000 K D) 20,400 K E) 18,000 K
What evidence supports the idea that a collision between two spiral galaxies might lead to the formation of a single elliptical galaxy?
A) observations of giant elliptical galaxies at the center of dense clusters that may have grown by consuming other galaxies B) observations of some elliptical galaxies surrounded by shells of stars that probably formed from stars stripped out of smaller galaxies C) observations of some elliptical galaxies with stars and gas clouds in their cores that orbit differently from the other stars in the galaxy D) the fact that elliptical galaxies dominate the galaxy populations at the cores of dense clusters of galaxies E) all of the above
A galvanometer with a resistance of 40.0 ? deflects full scale at a current of 2.0 mA. What resistance should be used with this galvanometer in order to construct a voltmeter that can read a maximum of 50 V?
A) 25 k? B) 27 k? C) 29 k? D) 31 k? E) 35 k?