Which of the following statements is TRUE about the Interstellar Medium (ISM)? T

Question

Which of the following statements is TRUE about the Interstellar Medium (ISM)? The ISM has ____________.

Question 1 options:

has a gas component that is mostly helium

has a gas component and a dust component that are well-mixed.

a uniform temperature throughout

a high density compared to the air we breathe

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Question 2 (1.75 points) Question 2 Unsaved

Which of the following materials can only be detected indirectly via emissions by CO molecules?

Question 2 options:

H2

HI

dust

HII

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Question 3 (1.75 points) Question 3 Unsaved

Which of the following materials scatters the blue component of visible light passing through it?

Question 3 options:

dust

H2

HI

HII

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Question 4 (1.75 points) Question 4 Unsaved

Which of the materials below is detected by a characteristic 21 cm microwave emission?

Question 4 options:

HII

H2

HI

dust

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Question 5 (1.75 points) Question 5 Unsaved

Which material is the ionized form of hydrogen?

Question 5 options:

HII

HI

H2

dust

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Question 6 (1.75 points) Question 6 Unsaved

Any gravitational contraction an object undergoes results in ____________ of the object.

Question 6 options:

decreasing mass

decreasing temperature

increasing temperature

increasing mass

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Question 7 (1.75 points) Question 7 Unsaved

The Jean's criterion determines the properties a molecular cloud must have in order to undergo star formation. These properties are ___________________.

Question 7 options:

low mass, low temperature, low density

large mass, high temperature, low density

large mass, low temperature, high density

low mass, high temperature, high density

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Question 8 (1.75 points) Question 8 Unsaved

The upper mass limit of a collapsing cloud fragment that will turn into a stable, main sequence star is about ____________ solar masses. Any larger and it would _____________.

Question 8 options:

.01, turn into a white dwarf star instead

100, collapse into a black hole

.01, not become hot and dense enough to ignite hydrogen fusion

100, burn through all of its hydrogen supply before it could settle into hydrostatic and thermal equilibrium

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Question 9 (1.75 points) Question 9 Unsaved

The lower mass limit of a collapsing cloud fragment that will turn into a stable, main sequence star is about ____________ solar masses. Any smaller and it would _____________.

Question 9 options:

100, burn through all of its hydrogen supply before it could settle into hydrostatic and thermal equilibrium

100, collapse into a black hole

.01, turn into a white dwarf star instead

.01, not become hot and dense enough to ignite hydrogen fusion

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Question 10 (1.75 points) Question 10 Unsaved

A planetary nebula comes from ________________ .

Question 10 options:

the cold, dense molecular cloud that will become a protostar

the remains of a supernova explosion

the ejected outer layers of a low-mass supergiant in its final stages

the part of the collapsing cloud of the final fragment that will become the planetary system

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Question 11 (1.75 points) Question 11 Unsaved

Which property of the stars in a star cluster is measured using the main sequence turn-off point?

Question 11 options:

Age

Composition

Distance

Mass

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Explanation / Answer

1. Option b is correct

The dust and gas are generally well mixed in the interstellar medium (ISM), as demonstrated observationally by the reasonably uniform correlation in the diffuse ISM between the hydrogen column density.

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