13 clickers

1. Chapter 13 Review Clickers
© 2014 Pearson Education, Inc.
The Cosmic Perspective
Seventh Edition
Other Planetary
Systems: The New
Science of Distant
Worlds

2. © 2014 Pearson Education, Inc.
Chapter 13
Is it easy to photograph of a planet orbiting
around another star?
a) Yes, but a large telescope because the planet would
be faint.
b) No, because the brightness of the star would
overwhelm the planet.
c) Yes, but a space telescope must be used so that the
scattered light from the star would be minimized.

3. © 2014 Pearson Education, Inc.
Chapter 13
Is it easy to photograph of a planet orbiting
around another star?
a) Yes, but a large telescope because the planet would
be faint.
b) No, because the brightness of the star would
overwhelm the planet.
c) Yes, but a space telescope must be used so that the
scattered light from the star would be minimized.

4. © 2014 Pearson Education, Inc.
Chapter 13
In order to maximize your chance of seeing a
faint, cooler planet next to a brighter, hotter
star, you should observe
a) in visible light.
b) in ultraviolet light.
c) in infrared light.
d) in X-ray light.

5. © 2014 Pearson Education, Inc.
Chapter 13
In order to maximize your chance of seeing a
faint, cooler planet next to a brighter, hotter
star, you should observe
a) in visible light.
b) in ultraviolet light.
c) in infrared light.
d) in X-ray light.

6. © 2014 Pearson Education, Inc.
Chapter 13
To detect an extrasolar planet by means of the
Doppler shift, you look for a periodic shift of the
spectrum lines
a) of the star the planet is orbiting.
b) of the planet.
c) of the star and the planet.

7. © 2014 Pearson Education, Inc.
Chapter 13
To detect an extrasolar planet by means of the
Doppler shift, you look for a periodic shift of the
spectrum lines
a) of the star the planet is orbiting.
b) of the planet.
c) of the star and the planet.

8. © 2014 Pearson Education, Inc.
Chapter 13
The orbital period of an unseen planet
a) will be the same as period of the star's Doppler
shift.
b) will be much longer than the star's.
c) will be much shorter than the star's.

9. © 2014 Pearson Education, Inc.
Chapter 13
The orbital period of an unseen planet
a) will be the same as period of the star's Doppler
shift.
b) will be much longer than the star's.
c) will be much shorter than the star's.

10. © 2014 Pearson Education, Inc.
Chapter 13
The shorter the period of the Doppler curve,
a) the closer the unseen planet is to the star.
b) the farther the unseen planet is from the star.
c) the greater the mass of the planet.
d) the smaller the mass of the planet.
e) A and C

11. © 2014 Pearson Education, Inc.
Chapter 13
The shorter the period of the Doppler curve,
a) the closer the unseen planet is to the star.
b) the farther the unseen planet is from the star.
c) the greater the mass of the planet.
d) the smaller the mass of the planet.
e) A and C

12. © 2014 Pearson Education, Inc.
Chapter 13
The larger the mass of the unseen planet,
a) the larger the Doppler shift of the star.
b) the smaller the Doppler shift of the star.
c) the faster the period of the star's Doppler shift.
d) the slower the period of the star's shift.
e) A and C

13. © 2014 Pearson Education, Inc.
Chapter 13
The larger the mass of the unseen planet,
a) the larger the Doppler shift of the star.
b) the smaller the Doppler shift of the star.
c) the faster the period of the star's Doppler shift.
d) the slower the period of the star's shift.
e) A and C

14. © 2014 Pearson Education, Inc.
Chapter 13
Suppose you found a star similar to the Sun
moving back and forth with a period of 2 years.
What could you conclude?
a) It has a planet orbiting at less than 1 AU.
b) It has a planet orbiting at greater than 1 AU.
c) It has a planet orbiting at exactly 1 AU.
d) It has a planet, but we don't know its mass so we
can't know its orbital distance for sure.

15. © 2014 Pearson Education, Inc.
Chapter 13
Suppose you found a star similar to the Sun
moving back and forth with a period of 2 years.
What could you conclude?
a) It has a planet orbiting at less than 1 AU.
b) It has a planet orbiting at greater than 1 AU.
c) It has a planet orbiting at exactly 1 AU.
d) It has a planet, but we don't know its mass so we
can't know its orbital distance for sure.

16. © 2014 Pearson Education, Inc.
Chapter 13
Jupiter is about 1/10 the diameter of the Sun. If
it transited, how much would the Sun's light
dim?
a) about 10% (it would be 90% of its regular brightness)
b) about 1% (it would be about 99% its regular
brightness)
c) about 30 % (it would be about 70% of its regular
brightness)
d) about 50% (it would be about half its regular
brightness)

17. © 2014 Pearson Education, Inc.
Chapter 13
Jupiter is about 1/10 the diameter of the Sun. If
it transited, how much would the Sun's light
dim?
a) about 10% (it would be 90% of its regular brightness)
b) about 1% (it would be about 99% its regular
brightness)
c) about 30 % (it would be about 70% of its regular
brightness)
d) about 50% (it would be about half its regular
brightness)

18. © 2014 Pearson Education, Inc.
Chapter 13
Most known extrasolar planets have larger
masses than Jupiter. This means that
a) our solar system is special in having many
terrestrial planets, including Earth.
b) all stars have smaller planets, but we just can't
detect them yet.
c) we won't know how many smaller planets are out
there until our searches become more sensitive.

19. © 2014 Pearson Education, Inc.
Chapter 13
Most known extrasolar planets have larger
masses than Jupiter. This means that
a) our solar system is special in having many
terrestrial planets, including Earth.
b) all stars have smaller planets, but we just can't
detect them yet.
c) we won't know how many smaller planets are
out there until our searches become more
sensitive.

20. © 2014 Pearson Education, Inc.
Chapter 13
Most known extrasolar planets have periods of
less than a few years, but are more massive
than Jupiter. This means that
a) our solar system has planets with unusually long orbits.
b) the planets we've discovered so far follow this trend, but
we may still discover longer-period extrasolar planets.
c) other planetary systems do not have the same layout
as our own.
d) all of the above
e) B and C

21. © 2014 Pearson Education, Inc.
Chapter 13
Most known extrasolar planets have periods of
less than a few years, but are more massive
than Jupiter. This means that
a) our solar system has planets with unusually long orbits.
b) the planets we've discovered so far follow this trend, but
we may still discover longer-period extrasolar planets.
c) other planetary systems do not have the same layout
as our own.
d) all of the above
e) B and C

22. © 2014 Pearson Education, Inc.
Chapter 13
Our theory of solar system formation predicts
that large, gaseous planets form far from their
star. How can we explain the extrasolar hot
Jupiters that are close to their stars?
a) Our theory is wrong.
b) Large planets do form far from their star, but their
orbits can change due to gravitational encounters
with other objects.
c) Large planets do form far from their star, but waves
of material can pull on planets and alter orbits.
d) B and C

23. © 2014 Pearson Education, Inc.
Chapter 13
Our theory of solar system formation predicts
that large, gaseous planets form far from their
star. How can we explain the extrasolar hot
Jupiters that are close to their stars?
a) Our theory is wrong.
b) Large planets do form far from their star, but their
orbits can change due to gravitational encounters
with other objects.
c) Large planets do form far from their star, but waves
of material can pull on planets and alter orbits.
d) B and C

24. © 2014 Pearson Education, Inc.
Chapter 13
Space missions are currently underway to
a) search for Earth-sized planets transiting stars.
b) search for wobbles in stars caused by planets
much less massive than Jupiter.
c) attempt to take direct images of extrasolar planets.
d) all of the above

25. © 2014 Pearson Education, Inc.
Chapter 13
Space missions are currently underway to
a) search for Earth-sized planets transiting stars.
b) search for wobbles in stars caused by planets
much less massive than Jupiter.
c) attempt to take direct images of extrasolar planets.
d) all of the above

26. © 2014 Pearson Education, Inc.
Chapter 13
How can the Doppler shift be used to search for
planets around other stars?
a) Astronomers look for a periodic, red-then-blue shift
in the spectrum of the planet.
b) Astronomers look for a periodic, red-then-blue shift
in the spectrum of the star.
c) Astronomers look to see if the star "wobbles" in the
sky, shifting slightly back and forth.

27. © 2014 Pearson Education, Inc.
Chapter 13
How can the Doppler shift be used to search for
planets around other stars?
a) Astronomers look for a periodic, red-then-blue shift
in the spectrum of the planet.
b) Astronomers look for a periodic, red-then-blue
shift in the spectrum of the star.
c) Astronomers look to see if the star "wobbles" in the
sky, shifting slightly back and forth.

28. © 2014 Pearson Education, Inc.
Chapter 13
How do astronomers look for planets whose
orbits might cause them to pass in front of a
star outside our solar system?
a) They look for a small black dot passing in front of
the star.
b) The look to see if the star's position shifts or
"wobbles" slightly in the sky.
c) The measure the star's brightness, and look for
periodic dimming (transits).

29. © 2014 Pearson Education, Inc.
Chapter 13
How do astronomers look for planets whose
orbits might cause them to pass in front of a
star outside our solar system?
a) They look for a small black dot passing in front of
the star.
b) The look to see if the star's position shifts or
"wobbles" slightly in the sky.
c) The measure the star's brightness, and look for
periodic dimming (transits).