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 transcript:

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.

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.

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.

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.

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

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

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.

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.

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

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

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.

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.

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)

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)