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Unformatted text preview: d. 10 e. 6.3 6. Star #1 has a classification of F5 and Star #2 has a classification of K0. With just this information alone, we can say for certain that Star #1 is a. more massive b. brighter c. hotter d. larger e. further away 7. Which of the following spectral classification of stars is in correct order of decreasing temperature? a. MKGJABO b. ABFGKMO c. OBFAKGM d. OBAFGKM e. OBAFKGM 8. Compared to a star in the middle of the HR diagram, a star in the lower left part is a. smaller b. cooler c. brighter d. nearer e. larger 9. What proportion of visible stars in the nighttime sky are binary or multiple-star systems? a. about 1% b. about 10% c. nearly 50% d. about 100% e. only about 1 out of every 1000 10. If the Earth’s orbit was shrunk to 0.8 AU, what would its period now be? a. 1.0 year b. 0.8 year c. 0.51 year d. 0.72 year e. 0.86 year ANSWERS 1. d 6. c 2. b 7. d 3. d 8. a 4. c 9. c 5. e 10. d P 2 = a 3...
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- Spring '12
- Physics, Stellar classification