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ASTRONOMY
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answerhappygod
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ASTRONOMY
ASTRONOMY
a. 6. Which of the following is a useful method for measuring the distance to the Andromeda galaxy? redshift b. the period-luminosity relationship for Cepheid variables c. moving cluster method d. parallax e. sending a spacecraft there c. e. c. 7. Which of the following is FALSE about nuclear fusion in the Sun? a. It is the source of the Sun's neutrinos. b. In making He, it liberates energy equivalent to the mass difference between four protons and a He nucleus. The probability of four protons colliding simultaneously to make a He nucleus is low, even in the Sun's core. d. It is dominated by the proton-proton chain. H to He burning in the core will proceed well into the Sun's red giant phase. 8. For a star of fixed size, what happens to its luminosity if you triple its temperature? a. It gets three times brighter. b. It gets three times fainter. It gets 81 times brighter. d. It gets redder. e. It stays in the same place on the H-R Diagram. 9. Which of the following is FALSE about Cepheid variables? a. Their periods range from over days to months. b. There is a very tight relationship between the period of their variability and their luminosity. c. They are very luminous. d. Dust between us and a Cepheid does not affect its apparent brightness. e. Cepheids are found in the Milky Way disk and in other galaxies. 10. Which of the following is FALSE about the gravitational force exerted on a body A at distance "r" from a uniform, spherically symmetric object B of mass "M" and radius “R”? a. At r>R, the gravitational force felt by A is independent of the radius R of object B. b. Atr> R, the gravitational force felt by A is independent of the mass M of object B. Atr>R, the gravitational force felt by A is inversely dependent on its distance squared, r?, from object B. d. Atr> R, the gravitational force felt by the side of A facing B is larger than the force felt by the side of A farthest from B. B could exert tidal forces on A and vice-versa. c. e.
a. 6. Which of the following is a useful method for measuring the distance to the Andromeda galaxy? redshift b. the period-luminosity relationship for Cepheid variables c. moving cluster method d. parallax e. sending a spacecraft there c. e. c. 7. Which of the following is FALSE about nuclear fusion in the Sun? a. It is the source of the Sun's neutrinos. b. In making He, it liberates energy equivalent to the mass difference between four protons and a He nucleus. The probability of four protons colliding simultaneously to make a He nucleus is low, even in the Sun's core. d. It is dominated by the proton-proton chain. H to He burning in the core will proceed well into the Sun's red giant phase. 8. For a star of fixed size, what happens to its luminosity if you triple its temperature? a. It gets three times brighter. b. It gets three times fainter. It gets 81 times brighter. d. It gets redder. e. It stays in the same place on the H-R Diagram. 9. Which of the following is FALSE about Cepheid variables? a. Their periods range from over days to months. b. There is a very tight relationship between the period of their variability and their luminosity. c. They are very luminous. d. Dust between us and a Cepheid does not affect its apparent brightness. e. Cepheids are found in the Milky Way disk and in other galaxies. 10. Which of the following is FALSE about the gravitational force exerted on a body A at distance "r" from a uniform, spherically symmetric object B of mass "M" and radius “R”? a. At r>R, the gravitational force felt by A is independent of the radius R of object B. b. Atr> R, the gravitational force felt by A is independent of the mass M of object B. Atr>R, the gravitational force felt by A is inversely dependent on its distance squared, r?, from object B. d. Atr> R, the gravitational force felt by the side of A facing B is larger than the force felt by the side of A farthest from B. B could exert tidal forces on A and vice-versa. c. e.
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