Question 1

If a material is highly opaque,then it

Accepted Answer

A) reflects most light. 
B) absorbs most light. 
C) transmits most light. 
D) scatters most light. 
E) emits most light. 
A) reflects most light. 
B) absorbs most light. 
C) transmits most light. 
D) scatters most light. 
E) emits most light.

Question 2

When white light passes through a cool cloud of gas,we see

Accepted Answer

A) visible light. 
B) infrared light. 
C) thermal radiation. 
D) an absorption line spectrum. 
E) an emission line spectrum. 
A) visible light. 
B) infrared light. 
C) thermal radiation. 
D) an absorption line spectrum. 
E) an emission line spectrum.

Question 3

If a material is transparent,then it

Accepted Answer

A) reflects light well. 
B) absorbs light well. 
C) transmits light well. 
D) scatters light well. 
E) emits light well. 
A) reflects light well. 
B) absorbs light well. 
C) transmits light well. 
D) scatters light well. 
E) emits light well.

Question 4

Which of the following statements about X-rays and radio waves is not true?

Accepted Answer

A) X-rays have shorter wavelengths than radio waves. 
B) X-rays and radio waves are both forms of light,or electromagnetic radiation. 
C) X-rays have higher frequency than radio waves. 
D) X-rays have higher energy than radio waves. 
E) X-rays travel through space faster than radio waves. 
A) X-rays have shorter wavelengths than radio waves. 
B) X-rays and radio waves are both forms of light,or electromagnetic radiation. 
C) X-rays have higher frequency than radio waves. 
D) X-rays have higher energy than radio waves. 
E) X-rays travel through space faster than radio waves.

Question 5

Everything looks red through a red filter because

Accepted Answer

A) the filter emits red light and absorbs other colors. 
B) the filter absorbs red light and emits other colors. 
C) the filter transmits red light and absorbs other colors. 
D) the filter reflects red light and transmits other colors. 
A) the filter emits red light and absorbs other colors. 
B) the filter absorbs red light and emits other colors. 
C) the filter transmits red light and absorbs other colors. 
D) the filter reflects red light and transmits other colors.

Question 6

Thermal radiation is defined as

Accepted Answer

A) radiation produced by a hot object. 
B) radiation in the infrared part of the spectrum. 
C) radiation that depends only on the emitting object's temperature. 
D) radiation in the form of emission lines from an object. 
E) radiation that is felt as heat. 
A) radiation produced by a hot object. 
B) radiation in the infrared part of the spectrum. 
C) radiation that depends only on the emitting object's temperature. 
D) radiation in the form of emission lines from an object. 
E) radiation that is felt as heat.

Question 7

Dissociation is the process in which

Accepted Answer

A) the bonds between atoms in a molecule are broken. 
B) a molecule goes from the solid phase to the gas phase. 
C) the bonds between electrons around an atomic nucleus are broken. 
D) an element changes into another form. 
E) an electron is shared between atomic nuclei. 
A) the bonds between atoms in a molecule are broken. 
B) a molecule goes from the solid phase to the gas phase. 
C) the bonds between electrons around an atomic nucleus are broken. 
D) an element changes into another form. 
E) an electron is shared between atomic nuclei.

Question 8

State the two laws of thermal radiation.

Accepted Answer

1.Hotter objects emit more rad

Question 9

Lines of a particular element appear at the same wavelength in both emission and absorption line spectra.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following statements about electrons is not true?

Accepted Answer

A) Electrons orbit the nucleus rather like planets orbiting the Sun. 
B) Within an atom,an electron can have only particular energies. 
C) Electrons can jump between energy levels in an atom only if they receive or give up an amount of energy equal to the difference in energy between the energy levels. 
D) An electron has a negative electrical charge. 
E) Electrons have very little mass compared to protons or neutrons. 
A) Electrons orbit the nucleus rather like planets orbiting the Sun. 
B) Within an atom,an electron can have only particular energies. 
C) Electrons can jump between energy levels in an atom only if they receive or give up an amount of energy equal to the difference in energy between the energy levels. 
D) An electron has a negative electrical charge. 
E) Electrons have very little mass compared to protons or neutrons.

Question 11

Any object moving relative to Earth will have a Doppler shift.

Accepted Answer

A) True 
 B)False

Question 12

Consider an atom of oxygen in which the nucleus contains 8 protons and 8 neutrons.If it is doubly ionized,what is the charge of the oxygen ion and how many electrons remain in the ion?

Accepted Answer

A) Charge = +2;number of remaining electrons = 8. 
B) Charge = -2;number of remaining electrons = 10. 
C) Charge = +2;number of remaining electrons = 6. 
D) Charge = +2;number of remaining electrons = 2. 
A) Charge = +2;number of remaining electrons = 8. 
B) Charge = -2;number of remaining electrons = 10. 
C) Charge = +2;number of remaining electrons = 6. 
D) Charge = +2;number of remaining electrons = 2.

Question 13

Define atomic weight (or atomic mass).

Accepted Answer

Atomic weight is the

Question 14

Which of the following objects is not a close approximation of a thermal emitter?

Accepted Answer

A) hot,thin gas 
B) a star 
C) a filament in a light bulb 
D) you 
E) a planet 
A) hot,thin gas 
B) a star 
C) a filament in a light bulb 
D) you 
E) a planet

Question 15

Emission lines from different ionization states of the same element appear in the same place in the spectrum.

Accepted Answer

A) True 
 B)False

Question 16

Process of Science: The theory of thermal radiation says that hot objects are bluer than cool objects.Does it depend on what the object is made of? How can you test this?

Accepted Answer

The color of thermal radiation from an o

Question 17

When light reflects off an object,what is the relation between the angle of incidence and the angle of reflection?

Accepted Answer

A) angle of incidence = angle of reflection 
B) angle of incidence + angle of reflection = 90° 
C) angle of incidence + angle of reflection = 180° 
D) angle of incidence - angle of reflection = 90° 
E) It depends on the material that the light reflects off. 
A) angle of incidence = angle of reflection 
B) angle of incidence + angle of reflection = 90° 
C) angle of incidence + angle of reflection = 180° 
D) angle of incidence - angle of reflection = 90° 
E) It depends on the material that the light reflects off.

Question 18

The following questions refer to the diagram below.The levels represent energy levels in a hydrogen atom.Each level is labeled with its energy (above the ground state of Level 1)in units of electron/volts (eV).The labeled transitions represent an electron moving between energy levels.
  
-Which transition represents an electron that absorbs a photon with 10.2 eV of energy?

Accepted Answer

The answer of The following questions refer to the diagram...

Question 19

When an atom loses an electron,it becomes

Accepted Answer

A) vaporized. 
B) dissociated. 
C) ionized. 
D) an isotope. 
E) a plasma. 
A) vaporized. 
B) dissociated. 
C) ionized. 
D) an isotope. 
E) a plasma.

Question 20

You observe the same spectral line in two stars that are identical in every way except that one rotates faster than the other.How does the spectral line differ between the two?

Accepted Answer

A) There is no difference. 
B) The line in the faster rotating star is blueshifted. 
C) The line in the faster rotating star is redshifted. 
D) The line in the faster rotating star is broader. 
E) The line in the faster rotating star is narrower. 
A) There is no difference. 
B) The line in the faster rotating star is blueshifted. 
C) The line in the faster rotating star is redshifted. 
D) The line in the faster rotating star is broader. 
E) The line in the faster rotating star is narrower.

Exam 5: Light and Matter: Reading Messages from the Cosmos

If a material is highly opaque,then it

When white light passes through a cool cloud of gas,we see

If a material is transparent,then it

Which of the following statements about X-rays and radio waves is not true?

Everything looks red through a red filter because

Thermal radiation is defined as

Dissociation is the process in which

State the two laws of thermal radiation.

Lines of a particular element appear at the same wavelength in both emission and absorption line spectra.

Which of the following statements about electrons is not true?

Any object moving relative to Earth will have a Doppler shift.

Consider an atom of oxygen in which the nucleus contains 8 protons and 8 neutrons.If it is doubly ionized,what is the charge of the oxygen ion and how many electrons remain in the ion?

Define atomic weight (or atomic mass).

Which of the following objects is not a close approximation of a thermal emitter?

Emission lines from different ionization states of the same element appear in the same place in the spectrum.

Process of Science: The theory of thermal radiation says that hot objects are bluer than cool objects.Does it depend on what the object is made of? How can you test this?

When light reflects off an object,what is the relation between the angle of incidence and the angle of reflection?

When an atom loses an electron,it becomes

You observe the same spectral line in two stars that are identical in every way except that one rotates faster than the other.How does the spectral line differ between the two?

A Modern View of the Universe

Discovering the Universe for Yourself

The Science of Astronomy

Making Sense of the Universe: Understanding Motion, Energy, and Gravity

Telescopes: Portals of Discovery

Our Planetary System

Formation of the Solar System

Planetary Geology: Earth and the Other Terrestrial Worlds

Planetary Atmospheres: Earth and the Other Terrestrial Worlds

Jovian Planet Systems

Asteroids, Comets, and Dwarf Planets: Their Nature, Orbits, and Impacts

Other Planetary Systems: The New Science of Distant Worlds

Our Star

Surveying the Stars

Star Birth

Star Stuff

The Bizarre Stellar Graveyard

Our Galaxy

Galaxies and the Foundations of Modern Cosmology

Galaxy Evolution

The Birth of the Universe

Dark Matter, Dark Energy, and the Fate of the Universe

Life in the Universe

Celestial Timekeeping and Navigation

Space and Time

Spacetime and Gravity

Building Blocks of the Universe

Filters