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

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Presentation on theme: "The expression “order of magnitude” corresponds to a)one factor of ten. b)one factor of two. c)a factor of 2.5 d)two factors of ten."— Presentation transcript:

1 The expression “order of magnitude” corresponds to a)one factor of ten. b)one factor of two. c)a factor of 2.5 d)two factors of ten.

2 The expression “order of magnitude” corresponds to a)one factor of ten. b)one factor of two. c)a factor of 2.5 d)two factors of ten.

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

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

5 Estimate the answer to 3.04 x 5.3: a)1.6 b)16 c)160 d)1,600 e)don’t know

6 Estimate the answer to 3.04 x 5.3: a)1.6 b)16 c)160 d)1,600 e)don’t know

7

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

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

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

11 Four stars magnitudes are 10, 7, -1, -10. Which star appears brightest from the Earth? a.the first. b.the fourth c.the second d.the third

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? a.Star X b.Star Y c.Neither – their parallax angles are the same.

13 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? a.Star X b.Star Y c.Neither – their parallax angles are the same.

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

15 Which of the following stars is closest to us? a.Procyon (parallax = 0.29 arcsecond) b.Ross 780 (parallax = 0.21 arcsecond) c.Regulus (parallax = 0.04 arcsecond) d.Sirius (parallax = 0.38 arcsecond)

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