R. These stars are old and were formed before there were many elements in the ga
ID: 304945 • Letter: R
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R. These stars are old and were formed before there were many elements in the galaxy Many atoms in these stars are ionized D. Much of their absorption is in the ultraviolet E. C and D 11) Select the two statements that are TRUE about the stars in an open cluster? A. There is an approximately equal number of all types of stars in an open cluster. B. All stars in the cluster have approximately the same mass. C. All stars in the cluster are approximately at the same stage in evolution. D. All stars in the cluster formed at about the same time. E. All stars in the cluster are about the same distance from Earth. CHAPTER 16 To receive ANY credit for this section, you MUST attempt at least 1 questions (5 points) in this section 12) What is the energy source that heats a contracting protostar? A. Friction among the particles making up the contracting material B. Pressure, as the gas and dust are compressed C. Gravitational potential energy released as the material is pulled inward D. Fusion E. Kinetic energy of the original particles within the contracting material What happens to the surface temperature and luminosity when gravity first assembles a protostar from a collapsing cloud? A. Its surface temperature and luminosity increase. B. Its surface temperature remains the same and its luminosity decreases. C. Its surface temperature and luminosity decrease D. Its surface temperature decreases and its luminosity increases. E. Its surface temperature and luminosity remain the same.Explanation / Answer
11. D and E. All stars in the cluster are approximately the same age. ie they are formed at the same time.
All the stars in the cluster are about the same distance from the earth.
12. C. Gravitation potential energy released as the material is pulled inward. Potential energy becomes kinetic energy and force the pressure and temperature up until it gets hot and dense enough for a fusion reaction to start taking place.
13. A. Its surface temperature and luminosity increase.
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