Physics

In the Milky Way galaxy, gas and dust are found:

In the Milky Way galaxy, gas and dust are found:

In the Milky Way galaxy, gas and dust are found:
A) in dark nebulae.
B) in neutral hydrogen clouds.
C) in molecular clouds.
D) in emission nebulae.
E) everywhere.

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The overall dimming of starlight by interstellar matter is called:

The overall dimming of starlight by interstellar matter is called:

The overall dimming of starlight by interstellar matter is called:
A) scattering.      B) reddening.      C) emission.       D) extinction.      E) absorption.

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The density of interstellar dust is very low, yet it still blocks starlight because:

The density of interstellar dust is very low, yet it still blocks starlight because:

The density of interstellar dust is very low, yet it still blocks starlight because:
A) there is 100 times more opaque gas than dust present in the ISM.
B) it is so cold it absorbs higher energy photons.
C) ice particles reflect all li

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The spectra of interstellar gas clouds show that they have the same basic composition as:

The spectra of interstellar gas clouds show that they have the same basic composition as:

The spectra of interstellar gas clouds show that they have the same basic composition as:
A) the Martian polar caps.
B) stars.
C) asteroids.
D) Earth's atmosphere.
E) interstellar dust.

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Which statement is true about the interstellar medium?

Which statement is true about the interstellar medium?

Which statement is true about the interstellar medium?
A) Gas obscures the light from distant stars.
B) Dust is spread uniformly through the galaxy.
C) Gas contains a lot of carbon atoms.
D) We know more about the gas than the dus

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Due to absorption of shorter wavelengths by interstellar dust clouds, distant stars appear:

Due to absorption of shorter wavelengths by interstellar dust clouds, distant stars appear:

Due to absorption of shorter wavelengths by interstellar dust clouds, distant stars appear:
A) to have a higher radial velocity.
B) larger.
C) brighter.
D) redder.
E) bluer.

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Some regions along the plane of the Milky Way appear dark because:

Some regions along the plane of the Milky Way appear dark because:

Some regions along the plane of the Milky Way appear dark because:
A) stars in that region are hidden by dark dust particles.
B) stars in that region are hidden by interstellar gas.
C) there are no stars in these areas.
D) many br

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Which of the following describes the shape of dust particles, based on polarization of light?

Which of the following describes the shape of dust particles, based on polarization of light?

Which of the following describes the shape of dust particles, based on polarization of light?
A) rodlike      B) disks      C) cubes      D) spheres      E) diamonds

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The ________ of light passing through thin dust clouds lets us map the Galaxy's magnetic field.

The ________ of light passing through thin dust clouds lets us map the Galaxy's magnetic field.

The ________ of light passing through thin dust clouds lets us map the Galaxy's magnetic field.
A) ionization      B) absorption      C) diffraction      D) granulation      E) pol

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What effect do even thin clouds of dust have on light passing through them?

What effect do even thin clouds of dust have on light passing through them?

What effect do even thin clouds of dust have on light passing through them?
A) It dims and reddens the light of all more distant stars.
B) Its motion causes all light to be redshifted as it passes through these clouds.
C) Its motion ca

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Interstellar gas is composed of:

Interstellar gas is composed of:

Interstellar gas is composed of:
A) only hydrogen.
B) 90% hydrogen, 9% helium by weight.
C) 10% hydrogen, 90% helium by numbers of atoms.
D) ammonia, methane, and water vapor.
E) some hydrogen, but mainly carbon dioxide.

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The polarization of light passing though the dust grains shows that:

The polarization of light passing though the dust grains shows that:

The polarization of light passing though the dust grains shows that:
A) the dust grains are aligned by a weak interstellar magnetic field.
B) the dust grains are elongated in shape.
C) the dust grains are chiefly made of iron.
D)

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In an eclipsing binary, the longer the stages of the eclipse take, the ________ the star.

In an eclipsing binary, the longer the stages of the eclipse take, the ________ the star.

In an eclipsing binary, the longer the stages of the eclipse take, the ________ the star.

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All classes of binary stars yield the basic information on stellar ________.

All classes of binary stars yield the basic information on stellar ________.

All classes of binary stars yield the basic information on stellar ________.

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Stars of the main sequence all fall in luminosity class ________.

Stars of the main sequence all fall in luminosity class ________.

Stars of the main sequence all fall in luminosity class ________.

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On the H-R diagram, most bright naked eye stars would lie at the ________.

On the H-R diagram, most bright naked eye stars would lie at the ________.

On the H-R diagram, most bright naked eye stars would lie at the ________.

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Capella is the same temperature as our Sun, but about ten times the Sun's diameter; it must be about

Capella is the same temperature as our Sun, but about ten times the Sun's diameter; it must be about

Capella is the same temperature as our Sun, but about ten times the Sun's diameter; it must be about ________ times as luminous as our star.

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If two stars are the same size and one is twice the temperature of the other, how much more luminous

If two stars are the same size and one is twice the temperature of the other, how much more luminous

If two stars are the same size and one is twice the temperature of the other, how much more luminous is the hotter one?

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From hottest to coolest, the seven letters for the star types are ________.

From hottest to coolest, the seven letters for the star types are ________.

From hottest to coolest, the seven letters for the star types are ________.

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The ________ magnitude of a star depends directly upon its luminosity and distance.

The ________ magnitude of a star depends directly upon its luminosity and distance.

The ________ magnitude of a star depends directly upon its luminosity and distance.

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A star with a parallax of 1 second of arc is at a distance of ________ by definition.

A star with a parallax of 1 second of arc is at a distance of ________ by definition.

A star with a parallax of 1 second of arc is at a distance of ________ by definition.

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For a star of 10 solar masses, its main sequence life span will be:

For a star of 10 solar masses, its main sequence life span will be:

For a star of 10 solar masses, its main sequence life span will be:
A) only 1/1000th of the Sun.
B) only a tenth of the Sun's.
C) ten times longer than our Sun's.
D) about a hundred times less than the Sun's.
E

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What is the typical main sequence lifetime of a B-type star?

What is the typical main sequence lifetime of a B-type star?

What is the typical main sequence lifetime of a B-type star?
A) 1 billion years
B) 100 million years
C) 10 billion years
D) 20 million years
E) less than a million years

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What is the typical main sequence lifetime of a G-type star?

What is the typical main sequence lifetime of a G-type star?

What is the typical main sequence lifetime of a G-type star?
A) 100 billion years
B) 10 billion years
C) 1 billion years
D) 10 million years
E) 100 million years

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What is the typical main sequence lifetime of an M-type star?

What is the typical main sequence lifetime of an M-type star?

What is the typical main sequence lifetime of an M-type star?
A) one billion years
B) ten million years
C) one million years
D) a trillion years
E) ten billion years

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What is the single most important characteristic in determining the course of a star's evolution?

What is the single most important characteristic in determining the course of a star's evolution?

What is the single most important characteristic in determining the course of a star's evolution?
A) mass
B) distance
C) surface temperature
D) density
E) absolute brightness

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In a spectroscopic binary, if a pair shows a combined set of lines tonight, but a maximum split two

In a spectroscopic binary, if a pair shows a combined set of lines tonight, but a maximum split two

In a spectroscopic binary, if a pair shows a combined set of lines tonight, but a maximum split two nights later, its orbital period must be:
A) eight days.      B) twelve days.      C) four days.     

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In a spectroscopic binary system, the star showing the larger blue shift is:

In a spectroscopic binary system, the star showing the larger blue shift is:

In a spectroscopic binary system, the star showing the larger blue shift is:
A) hotter and receding faster.
B) more massive and approaching us.
C) cooler and receding the fastest.
D) less massive of the pair and receding slower.

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In a visual binary system with circular orbits, if in 20 years the two stars' position angles have s

In a visual binary system with circular orbits, if in 20 years the two stars' position angles have s

In a visual binary system with circular orbits, if in 20 years the two stars' position angles have shifted by 30 degrees, the pair's period must be:
A) 360 years.      B) 120 years.      C) 240 years. 

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Which type of binary can have their sizes measured directly by photometry?

Which type of binary can have their sizes measured directly by photometry?

Which type of binary can have their sizes measured directly by photometry?
A) virtual      B) visual      C) eclipsing      D) astrometric      E) spectroscopic

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Upon what data do measurements of sizes of eclipsing binaries depend?

Upon what data do measurements of sizes of eclipsing binaries depend?

Upon what data do measurements of sizes of eclipsing binaries depend?
A) their masses and luminosities
B) their temperatures and speeds
C) their temperatures and masses
D) their Doppler shifts and durations of stages of their ecli

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In general, the narrower the spectral line of a star:

In general, the narrower the spectral line of a star:

In general, the narrower the spectral line of a star:
A) the cooler the star is.
B) the bigger the star is.
C) the smaller the star is.
D) the hotter the star is.
E) the denser the star is.

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Having nothing to do with trigonometry, ________ parallaxes use the width of absorption lines to est

Having nothing to do with trigonometry, ________ parallaxes use the width of absorption lines to est

Having nothing to do with trigonometry, ________ parallaxes use the width of absorption lines to estimate the star's luminosity and size and distance.
A) photometric      B) spectroscopic      C) bolometric&nbs

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In the H-R diagram, the bright blue-white stars that dominate the naked eye sky lie to the:

In the H-R diagram, the bright blue-white stars that dominate the naked eye sky lie to the:

In the H-R diagram, the bright blue-white stars that dominate the naked eye sky lie to the:
A) top center.
B) top right.
C) bottom left.
D) top left.
E) middle of the main sequence.

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On the H-R diagram, white dwarfs lie Sirius B and Procyon B lie:

On the H-R diagram, white dwarfs lie Sirius B and Procyon B lie:

On the H-R diagram, white dwarfs lie Sirius B and Procyon B lie:
A) at the lower left.
B) close to the Sun, near the center.
C) at the lower right.
D) at the top right.
E) at the top left.

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On the H-R diagram, red supergiants like Betelguese lie:

On the H-R diagram, red supergiants like Betelguese lie:

On the H-R diagram, red supergiants like Betelguese lie:
A) at the bottom left.
B) at the top left.
C) at the bottom right.
D) at the top right.
E) They can't be plotted, for they are not main sequence.

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How might the most common occurring stars be described, based on our stellar neighborhood?

How might the most common occurring stars be described, based on our stellar neighborhood?

How might the most common occurring stars be described, based on our stellar neighborhood?
A) white dwarfs
B) M main sequence
C) A main sequence
D) G main sequence
E) K giants

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The Hertzsprung-Russell Diagram plots ________ against the spectral type or temperature.

The Hertzsprung-Russell Diagram plots ________ against the spectral type or temperature.

The Hertzsprung-Russell Diagram plots ________ against the spectral type or temperature.
A) mass
B) size or density
C) brightness or apparent magnitude
D) luminosity or absolute magnitude
E) distance

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Which of the following is the most common type of star?

Which of the following is the most common type of star?

Which of the following is the most common type of star?
A) red giants
B) blue supergiants
C) low mass main sequence
D) high mass main sequence
E) white dwarfs

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On the H-R diagram, the Sun lies:

On the H-R diagram, the Sun lies:

On the H-R diagram, the Sun lies:
A) about the middle of the main sequence.
B) at the top right.
C) at the bottom left.
D) at the bottom right.
E) at the top left.

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