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The expression “order of magnitude” corresponds to one factor of ten. one factor of two.

The expression “order of magnitude” corresponds to one factor of ten. one factor of two. a factor of 2.5 two factors of ten . The expression “order of magnitude” corresponds to one factor of ten. one factor of two. a factor of 2.5 two factors of ten .

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The expression “order of magnitude” corresponds to one factor of ten. one factor of two.

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  1. The expression “order of magnitude” corresponds to • one factor of ten. • one factor of two. • a factor of 2.5 • two factors of ten.

  2. The expression “order of magnitude” corresponds to • one factor of ten. • one factor of two. • a factor of 2.5 • two factors of ten.

  3. At the start of the 21st century, the number of human beings alive on Earth was approximately 6,000,000,000 or • 6 to the 9th power • 6 to the 9th power of ten • 6 times ten to the 9th power • 6,000 million • both c and d.

  4. At the start of the 21st century, the number of human beings alive on Earth was approximately 6,000,000,000 or • 6 to the 9th power • 6 to the 9th power of ten • 6 times ten to the 9th power • 6,000 million • both c and d.

  5. Estimate the answer to 3.04 x 5.3: • 1.6 • 16 • 160 • 1,600 • don’t know

  6. Estimate the answer to 3.04 x 5.3: • 1.6 • 16 • 160 • 1,600 • don’t know

  7. Using the magnitude system of astronomy, how would the brightness of an 8th magnitude star compare to a 7th magnitude star? • 10 times brighter than the 7th magnitude star. • 10 times dimmer than the 7th magnitude star. • 2.5 times brighter than the 7th magnitude star. • 2.5 times dimmer than the 7th magnitude star.

  8. Using the magnitude system of astronomy, how would the brightness of an 8th magnitude star compare to a 7th magnitude star? • 10 times brighter than the 7th magnitude star. • 10 times dimmer than the 7th magnitude star. • 2.5 times brighter than the 7th magnitude star. • 2.5 times dimmer than the 7th magnitude star.

  9. Four stars magnitudes are 10, 7, -1, -10. Which star appears brightest from the Earth? • the first. • the fourth • the second • the third

  10. Four stars magnitudes are 10, 7, -1, -10. Which star appears brightest from the Earth? • the first. • the fourth • the second • the third

  11. Star X is known to be 10 parsecs away from us and star Y is 50 parsecs away. Which star has the greater parallax angle? • Star X • Star Y • Neither – their parallax angles are the same.

  12. Star X is known to be 10 parsecs away from us and star Y is 50 parsecs away. Which star has the greater parallax angle? • Star X • Star Y • Neither – their parallax angles are the same.

  13. Which of the following stars is closest to us? • Procyon (parallax = 0.29 arcsecond) • Ross 780 (parallax = 0.21 arcsecond) • Regulus (parallax = 0.04 arcsecond) • Sirius (parallax = 0.38 arcsecond)

  14. Which of the following stars is closest to us? • Procyon (parallax = 0.29 arcsecond) • Ross 780 (parallax = 0.21 arcsecond) • Regulus (parallax = 0.04 arcsecond) • Sirius (parallax = 0.38 arcsecond)

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