PHYS 1302 Exam 2 CH 22-24

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University of Houston, Downtown *

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1302

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Astronomy

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Oct 30, 2023

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Question 1 1. According to X-ray observations, the space between galaxies in a galactic cluster is very cold. True False Question 2 1. Neutron stars and black holes are formed by: the star formation process. mass transfer in binary star systems. novae. type I supernovae. type II supernovae. Question 3 1. ________ galaxies seem to represent a transition between quasars and similar active nuclei compared to more normal spirals. Seyfert Elliptical Barred-Spiral Irregular Question 4 1. When galaxies merge to form larger galaxies. They fragment They evolve They release gas to interstellar space They become elliptical Question 5

1. What is one of the differences between Cepheids and RR Lyrae variables? Cepheids are giants, but RR Lyrae stars are still on the main sequence. All Cepheids have the same brightness, but RR Lyrae stars vary greatly in luminosity. The period-luminosity relation holds only for RR Lyrae stars. The pulsations of RR Lyrae stars are much less regular than those of Cepheids. The RR Lyrae stars have much shorter periods than Cepheids. Question 6 1. It is believed that the merger of a spiral galaxy and a dwarf galaxy probably results in a larger spiral galaxy. elliptical galaxy. irregular galaxy. smaller spiral galaxy. Question 7 1. The total energy emitted by the brightest nova explosions is about 1,000 Suns. 50,000 Suns. a million Suns. a billion Suns. Question 8 1. A technique for measuring the mass of a galaxy. heat transfer by X-ray detection galaxy radiation curves galaxy rotational curves dark matter gravitational curves Question 9

1. __________ galaxies of type ______show spherical symmetry, like a huge globular cluster; they spin very slowly. ______ spin faster, and are more flattened into a lens shape, but they don't show the disks found in spirals. Elliptical, E0, E7 Spiral, Sa, Sc Elliptical, E7, E0 Spiral, Sb, Sc Question 10 1. It was the distribution of ________ that showed Harlow Shapley we were no where near the center of the Milky Way in the 1920s. planetary nebulae emission nebulae open clusters globular clusters supernova remnants Question 11 1. Neutron stars do NOT have: masses greater than 1.4 solar masses. sizes comparable to large cities. strong magnetic fields. large surface gravities, compared to the Sun. rotation periods comparable to the Sun's. Question 12 1. ________ galaxies are essentially featureless; their light reveals evidence for the presence of only old red Main Sequence and red giant stars. elliptical irregular

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spiral SBa SBc Question 13 1. Is there any evidence that our own galaxy has collided with another in the past? Yes No Question 14 1. According to current theories of galactic evolution, quasars occur early in the evolutionary sequence. True False Question 15 1. The rotational velocity of a galaxy is a factor of distance mass density size Question 16 1. If light from a distant star passes close to a massive body, the light beam will: bend towards the star due to gravity.

continue moving in a straight line. change color to a shorter wavelength. slow down. accelerate due to gravity. Question 17 1. Special relativity says that c, the speed of light, is the maximum velocity for both matter and energy in our universe. TRUE FALSE Question 18 1. The type of radiation coming from active nuclei due to electrons spiraling in very strong magnetic fields at relativistic speeds is: positron radiation. thermal energy. a blackbody curve. synchrotron radiation. nuclear energy. Question 19 1. In the solar neighborhood we can map the position of spiral arms by observation of objects that are determined to be relatively ________ in age. young old current space-time Question 20 1. The observed slowing of a clock in the vicinity of a black hole is a prediction of: the Roche Limit.

Special relativity. General relativity. Stellar nucleosynthesis. the Cosmological Principle. Question 21 1. Population I stars came billions of years before Population II stars. True False Question 22 1. For what type of object is the period-luminosity relation used for determining distances? RR Lyrae variables T Tauri variables Cepheids Cataclysmic variables Planetary nebulae Question 23 1. A white dwarf can explode when its mass exceeds the Chandrasekhar limit. its electron degeneracy increases enormously. fusion reactions increase in their core. Iron in its core collapses. Question 24 1. The majority of the mass of the Milky Way lies farther out than the Sun's orbit.

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