Question 1

Interstellar dust scatters _____________light more than _____________light.

Accepted Answer

blue; red

Question 2

The type of radiation that is emitted when the electron in a hydrogen atom experiences a spin flip is a (n) _______________.

Accepted Answer

radio wave

Question 3

What produces the coronal gas?

Accepted Answer

1. Astronomers have evidence that most coronal gas is produced when massive stars die violently in supernova explosions.  Although they are rare, such explosions blast large amounts of very hot gas outward in expanding bubbles.
2.  Gas flowing away from very hot, young stars can also produce coronal gas. In some cases, neighboring bubbles of coronal gas may expand into each other and merge to form larger volumes called superbubbles.

Question 4

Molecular clouds are mapped using _____ gas instead of the most-abundant hydrogen because itradiates at radio wavelengths more efficiently.

Accepted Answer

A)  oxygen III 
B)  oxygen II 
C)  helium II 
D)  carbon monoxide 
E)  carbon dioxide 
A)  oxygen III 
B)  oxygen II 
C)  helium II 
D)  carbon monoxide 
E)  carbon dioxide

Question 5

The pressure of a gas depends on the ____ and ____ of the gas.

Accepted Answer

A)  density; volume 
B)  temperature; density 
C)  temperature; mass 
D)  temperature; volume 
E)  density; mass 
A)  density; volume 
B)  temperature; density 
C)  temperature; mass 
D)  temperature; volume 
E)  density; mass

Question 6

Coronal gas emits x-rays and has temperatures of ____.

Accepted Answer

A)    K o r higher 
B)  more than   K but less than   K 
C)  5000 K 
D)  between1000 K to 5000 K 
E)  less than 500K 
A)    K o r higher 
B)  more than   K but less than   K 
C)  5000 K 
D)  between1000 K to 5000 K 
E)  less than 500K

Question 7

H II emission nebula regions are found around _____________.

Accepted Answer

high tempe

Question 8

Which mission passed the bow shock in the Universe?

Accepted Answer

A)  Cassini-Huygens 
B)  Interstellar Boundary Explorer 
C)  Voyager I 
D)  Voyager II 
E)  Kepler 
A)  Cassini-Huygens 
B)  Interstellar Boundary Explorer 
C)  Voyager I 
D)  Voyager II 
E)  Kepler

Question 9

Large molecular clouds will form into protostars because of ____.

Accepted Answer

A)  the thermal motions of the atoms in the gas cloud 
B)  gravitational contraction 
C)  radiation pressure from nearby stars 
D)  the temperature reaching a critical point 
E)  condensation of dust and gas 
A)  the thermal motions of the atoms in the gas cloud 
B)  gravitational contraction 
C)  radiation pressure from nearby stars 
D)  the temperature reaching a critical point 
E)  condensation of dust and gas

Question 10

The composition of the interstellar dust suggests that it is formed primarily in the atmospheres of cool stars.

Accepted Answer

A) True 
 B)False

Question 11

Calculations of the Sun's future evolution indicate that it will blow away almost half of its mass in several relatively short episodes about 4 to 5 billion years from now before it is finally extinguished.

Accepted Answer

A) True 
 B)False

Question 12

Because blue light has a shorter wavelength than red light, it will be more readily scattered.

Accepted Answer

A) True 
 B)False

Question 13

_______________ is believed to be produced by supernova explosions.

Accepted Answer

The answer of _______________ is believed to be produced by...

Question 14

Stars are born in reflection nebulae.

Accepted Answer

A) True 
 B)False

Question 15

Which type of nebulae is produced when short-wavelength scatters from the dust and displays a blue hue?

Accepted Answer

A)  emission nebulae 
B)  H I 
C)  reflection nebulae 
D)  dark nebulae 
E)  spectral type B6 
A)  emission nebulae 
B)  H I 
C)  reflection nebulae 
D)  dark nebulae 
E)  spectral type B6

Question 16

What is the most abundant element in the interstellar medium?

Accepted Answer

A)  carbon 
B)  iron dust 
C)  carbon dust 
D)  helium 
E)  hydrogen 
A)  carbon 
B)  iron dust 
C)  carbon dust 
D)  helium 
E)  hydrogen

Question 17

Elements such as carbon, silicon and oxygen have been produced in stars and expelled as stars age in the interstellar medium. This is most likely due to these elements having cooled and condensed from aging stars to form dust grains, and carried out by a powerful winds.

Accepted Answer

A) True 
 B)False

Question 18

The interstellar reddening does not shift the _______________ of spectral lines, as does the Doppler effect.

Accepted Answer

The answer of The interstellar reddening does not shift the...

Question 19

Nebula is just another name for the interstellar medium (ISM).

Accepted Answer

A) True 
 B)False

Question 20

To an observer on Earth, dust in the interstellar medium will cause a star to appear _______________ and_______________than it really is.

Accepted Answer

fainter; c

Exam 10: The Interstellar Medium

Interstellar dust scatters _____________light more than _____________light.

The type of radiation that is emitted when the electron in a hydrogen atom experiences a spin flip is a (n) _______________.

What produces the coronal gas?

Molecular clouds are mapped using _____ gas instead of the most-abundant hydrogen because itradiates at radio wavelengths more efficiently.

The pressure of a gas depends on the ____ and ____ of the gas.

Coronal gas emits x-rays and has temperatures of ____.

H II emission nebula regions are found around _____________.

Which mission passed the bow shock in the Universe?

Large molecular clouds will form into protostars because of ____.

The composition of the interstellar dust suggests that it is formed primarily in the atmospheres of cool stars.

Calculations of the Sun's future evolution indicate that it will blow away almost half of its mass in several relatively short episodes about 4 to 5 billion years from now before it is finally extinguished.

Because blue light has a shorter wavelength than red light, it will be more readily scattered.

_______________ is believed to be produced by supernova explosions.

Stars are born in reflection nebulae.

Which type of nebulae is produced when short-wavelength scatters from the dust and displays a blue hue?

What is the most abundant element in the interstellar medium?

Elements such as carbon, silicon and oxygen have been produced in stars and expelled as stars age in the interstellar medium. This is most likely due to these elements having cooled and condensed from aging stars to form dust grains, and carried out by a powerful winds.

The interstellar reddening does not shift the _______________ of spectral lines, as does the Doppler effect.

Nebula is just another name for the interstellar medium (ISM).

To an observer on Earth, dust in the interstellar medium will cause a star to appear _______________ and_______________than it really is.

Here and Now

A Users Guide to the Sky

Moon Phases and Eclipses

Origins of Modern Astronomy

Gravity

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

Formation and Structure of Stars

Stellar Evolution

Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies

Supermassive Black Holes and Active Galaxies

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth the Active Planet

The Moon and Mercury

Venus and Mars

Jupiter and Saturn

Uranus Neptune Pluto and the Kuiper Belt

Meteorites Asteroids and Comets

Astrobiology

Filters

Interstellar dust scatters _light more than _light.

The pressure of a gas depends on the and of the gas.

To an observer on Earth, dust in the interstellar medium will cause a star to appear _ and_than it really is.