Astronomy 104 Exam #2

Question 1 of 30

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What advantage do you gain by having two eyes that are separated on your face, rather than being very close together?

Select one of the following:

  • Better collecting area, which allows you to see dimmer objects

  • Double vision, which allows you to see multiple objects at once

  • Color vision, which allows you to determine temperatures

  • Stereoscopic vision, which allows you to determine distances

  • Better magnification, which allows you to see smaller objects

Question 2 of 30

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To measure the parallax of the most distant stars measurable, we would make two measurements of the star's position on the sky separated by:

Select one of the following:

  • 6 hours

  • 12 hours

  • 24 hours

  • 6 months

  • 2 months

Question 3 of 30

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Stars A and B appear equally bright, but star A is twice as far away from us as star B. Which of the following is true?

Select one of the following:

  • Star A is twice as luminous as star B

  • Star A is four times as luminous as star B

  • Star B is four times as luminous as star B

  • Star B is twice as luminous as star A

  • Star A and star B have the same luminosity because they have the same brightness

Question 4 of 30

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Which sequence correctly lists the spectral classes of stars in order from hottest to coolest?

Select one of the following:

  • ABFGKMO

  • OABGFMK

  • EIEIO

  • OBAFGKM

  • MKGFABO

Question 5 of 30

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The faster-moving star in a binary is:

Select one of the following:

  • The less massive star

  • The more massive star

  • The smaller radius star

  • The larger radius star

  • The lower temperature star

Question 6 of 30

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On a typical H-R diagram, where are the stars with the largest radii located?

Select one of the following:

  • In the upper left corner

  • in the upper right corner

  • In the center

  • In the lower left corner

  • In the lower right corner

Question 7 of 30

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The one property of a main-sequence star that determines all its other properties is its:

Select one of the following:

  • Luminosity

  • Mass

  • Temperature

  • Spectral Type

  • Brightness

Question 8 of 30

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Hydrostatic equilibrium is a balance between:

Select one of the following:

  • Heat and centrifugal force

  • Core temperature and surface temperature

  • Pressure and gravity

  • Radiation and heat

  • Centrifugal force and gravity

Question 9 of 30

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The majority of the Sun's energy come from:

Select one of the following:

  • Gravitational contraction

  • Nuclear fission of uranium

  • Hydrogen fusion

  • Helium burning

  • Burning material as in a fire

Question 10 of 30

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If the core of the Sun were hotter than it is now, how would the Sun's energy production change?

Select one of the following:

  • It would produce less energy per second then it does now

  • It would produce more energy per second than it does now

  • Its energy production would vary more than it does now

  • Its energy production would be more stable than it is now

  • The Sun's energy production would not change

Question 11 of 30

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What do astronomers mean when they say that the Sun makes energy by hydrogen burning?

Select one of the following:

  • The Sun is combusting hydrogen in a fire and releasing energy

  • The Sun is fusing hydrogen into uranium and releasing energy

  • The Sun is made of mostly hydrogen at very high temperature

  • The Sun is fusing hydrogen into helium and releasing energy

  • The Sun is accumulating hydrogen from the solar wind and releasing energy

Question 12 of 30

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Which of these can travel directly from the center of the Sun to Earth in about 8 minutes?

Select one of the following:

  • Photons

  • Electrons

  • Protons

  • Neutons

  • Neutinos

Question 13 of 30

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The magnetic field of the Sun is continuously produced and deformed by:

Select one of the following:

  • Its differential rotation

  • The solar wind

  • Changes in the rate of nuclear fusion in the core

  • Liquid conducting layer in the interior

  • This is a trick question, the solar magnetic field is primordial

Question 14 of 30

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If you could watch stars forming out of a gas cloud, which stars would form first?

Select one of the following:

  • Low-mass stars

  • Medium-mass stars

  • High-mass stars

  • The ones with most natural talents

  • Stars with more heavy elements

Question 15 of 30

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Warm ionized gas in the interstellar medium appear _____ when imaged in the optical region of the electromagnetic spectrum.

Select one of the following:

  • Red

  • Yellow

  • White

  • Blue

  • Dark

Question 16 of 30

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21-cm radiation is important because:

Select one of the following:

  • It allows us to study the deep interiors of stars

  • It allows us to image magnetic fields directly

  • It allows us to study neutral hydrogen in the interstellar medium

  • It is produced by every object in the universe

  • It is the longest wavelength of light that can naturally be produced

Question 17 of 30

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An accretion disk forms around a collapsing protostar because infalling material must conserve:

Select one of the following:

  • Energy

  • Centrifugal force

  • Gravity

  • Velocity

  • Angular Momentum

Question 18 of 30

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The source of energy for a contracting protostar comes from:

Select one of the following:

  • Thermonuclear energy

  • Kinetic energy

  • Chemical Energy

  • Gravitational potential energy

  • Radiation energy

Question 19 of 30

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Of the following processes at work in molecular clouds, which is the one that inevitably dominates the clouds's evolution?

Select one of the following:

  • Magnetic fields

  • Conservation of angular momentum

  • Pressure

  • Gravity

  • Turbulence

Question 20 of 30

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What critical event transforms a protostar into a normal main-sequence star?

Select one of the following:

  • Planets in the accretion disk

  • The star grows suddenly larger in radius

  • Triple alpha reactions begin in the core

  • Nuclear fusion begins in the core

  • Convection begins throughout the star's interior

Question 21 of 30

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A nova is the result of which explosive situation?

Select one of the following:

  • Mass transfer onto a white dwarf

  • Helium burning in a degenerate stellar core

  • A white dwarf which exceeds the Chandrasekhar limit

  • The collision of members of a binary system

  • Runaway nuclear reactions in the core

Question 22 of 30

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The principal means by which high-mass stars generate energy on the main sequence is called:

Select one of the following:

  • The proton-proton chain

  • The carbon-carbon reaction

  • The triple-alpha process

  • The CNO Cycle

  • Neutrino cooling

Question 23 of 30

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Massive stars synthesize chemical elements going from helium up to iron:

Select one of the following:

  • Throughout the interior

  • Primarily at the surface

  • Only in the core of the star

  • Along the equator of the star

  • In a deep convection zone in the interior of the star

Question 24 of 30

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What causes massive stars to expel their outer layers?

Select one of the following:

  • Radiation pressure

  • High magnetic fields

  • Rapid rotation

  • Carbon fusion

  • Emission of neutrinos

Question 25 of 30

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During the main-sequence evolution of a massive star, increasingly heavier elements are fused in the core, giving the core support for:

Select one of the following:

  • Longer and longer times

  • Shorter and shorter times

  • An approximately equal amount of time

  • Approximately 10,000 years

  • Only a few days

Question 26 of 30

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The Crab Nebula is an important test of our ideas about supernova explosions because:

Select one of the following:

  • People saw the supernova and later astronomers found a pulsar inside the nebula

  • The system contains X-Ray binary

  • The nebula is expanding slowly, as expected from mass loss rates in massive stars

  • Crabs must have evolved before humans

  • Astronomers observed the merger of the two stars

Question 27 of 30

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Which of these begins first in the core of a massive star?

Select one of the following:

  • Silicon fusion to iron

  • Neon fusion to magnesium

  • Carbon fusion to neon

  • Helium fusion to carbon

  • Hydrogen fusion to helium

Question 28 of 30

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Where did all heavy elements in the Sun come from?

Select one of the following:

  • Previous generation of stars seeded the interstellar medium out of the Sun formed

  • Nearby supernova explosions directly contaminated the Sun's surface

  • Nucleosynthesis within the Sun generated all the elements we see in the solar spectrum

  • The Sun gobbled up some planets during the early days of our Solar System

  • The solar wind carries away hydrogen and helium, leaving behind the heavy elements

Question 29 of 30

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Iron has 26 protons in its nucleus, and gold has 79 protons. Where did all the gold on the Earth come from?

Select one of the following:

  • Nucleosynthesis on the surfaces of neutron stars

  • Nucleosynthesis that took place in supernova explosions

  • Nucleosynthesis in the cores of low-mass stars

  • Nucleosynthesis in the cores of massive stars

  • Nucleosynthesis in red giant and horizontal-branch stars

Question 30 of 30

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According to Einstein's relativity, which two quantities are different manifestations of the same thing?

Select one of the following:

  • Mass and gravity

  • Light and energy

  • Energy and mass

  • Temperature and energy

  • Distance and time

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Astronomy 104 Exam #2

Natalie Balzert
Quiz by , created about 1 year ago

Astronomy 104 Exam 2

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Natalie Balzert
Created by Natalie Balzert about 1 year ago
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