exam2_review

exam2_review - Exam #2 Review Sheet Part #1 Clicker...

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Exam #2 Review Sheet Part #1 Clicker Questions 1) The energy of a photon emitted by thermonuclear processes in the core of the Sun takes thousands or even millions of years to emerge from the surface because a) it is circling in the gravitational field of the Sun. b) it loses energy due to convection, conduction, and radiation c) of the Sun's enormous radius d) it is absorbed and re-emitted countless times along the way 2) According to the Ideal Gas Law, if the temperature in the core of a star is made 4-times higher, which of the following can happen? a) The pressure increases by 4 times and the density remains the same b) The density increases by 4 times and the pressure remains the same c) Its pressure and density both double. d) The pressure increases by 4 times while density decreases by 4 times Its pressure and density both decrease by 3) Sunspots appear dark because they are a) holes in the photosphere through which you can see deeply into the stellar interior. b) a bit cooler and thus dimmer than the rest of the photosphere. c) large opaque structures that block light from the glowing solar surface. d) causing retinal damage. 4) Which of the following do NOT follow an 11 year cycle? a) The number of sunspots on the Sun. b) The typical latitude of sunspots on the Sun. c) The rate of solar flares. d) Incidence of strong aurora on the Earth. e) None of the above. 5) Stars are: a) solid. b) liquid. c) gaseous. d) mostly carbon, oxygen, nitrogen, and iron. e) both c and d. 6) Which property of a star would not change if we could observe it from twice as far away? a) Angular size b) Color c) Flux d) Parallax e) Proper Motion 7) Two stars have the same surface temperature, but the radius of one is 100 times that of the other. How much more luminous is the larger star? a) 10 times more luminous.
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b) 100 times more luminous. c) 10,000 times more luminous. d) 100,000,000 times more luminous. e) The stars have the same more luminosity. 8) A cool star that is very luminous must have : a) A small radius b) A large radius c) A small mass d) A great distance e) A low velocity 9) How do we determine the temperature of a star in order to place it on the H-R diagram? a) The temperature is related to the mass of a star, which we can measure using Kepler’s laws. b) The temp is related to the size of the star, which we observe with our telescopes.
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exam2_review - Exam #2 Review Sheet Part #1 Clicker...

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