Lecture17_110f2007

Lecture17_110f2007 - Which kind of star is hottest? A. B....

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1 Which kind of star is hottest? A. M star B. F star C. A star D. K star Which kind of star is hottest? A. M star B. F star C. A star D. K star The luminosity of a star: A. Is another name for its apparent brightness. B. Can be calculated from the apparent brightness and distance to the star. C. Depends on star’s surface temperature only. D. Depends on star’s size only. The luminosity of a star: A. Is another name for its apparent brightness. B. Can be calculated from the apparent brightness and distance to the star. C. Depends on star’s surface temperature only. D. Depends on star’s size only. If the Sun were twice as far away from us (at 2AU), then how would its luminosity change? A. It would decrease 4 times. B. It would decrease 2 times C. It would increase 4 times. D. It would increase 2 times. E. It would not change. If the Sun were twice as far away from us (at 2AU), then how would its luminosity change? A. It would decrease 4 times. B. It would decrease 2 times C. It would increase 4 times. D. It would increase 2 times. E. It would not change.
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2 If the Sun were twice larger in diameter, then how would its luminosity change? A. It would decrease 4 times. B. It would decrease 2 times C. It would increase 4 times. D. It would increase 2 times. E. It would not change. If the Sun were twice larger in diameter, then how would its luminosity change? A. It would decrease 4 times. B. It would decrease 2 times C. It would increase 4 times. D. It would increase 2 times.
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Lecture17_110f2007 - Which kind of star is hottest? A. B....

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