Question 1

The number of protons in the nucleus determines which element it is.

Accepted Answer

A) True 
 B)False  True

Question 2

If λ = 2.90 × 106/ T  expresses the relationship between Kelvin temperature and the wavelength of maximum intensity in nanometers, what is the wavelength in nanometers of maximum intensity for a star with a surface temperature of 7 250 K?

Accepted Answer

400,400 nm,400 nanometers

Question 3

A spectrum that displays no energy except at very specific wavelengths where intense radiation is observed is a(n) ____ spectrum.

Accepted Answer

A)  absorption 
B)  emission 
C)  continuous 
D)  Doppler 
E)  ionization 
A)  absorption 
B)  emission 
C)  continuous 
D)  Doppler 
E)  ionization B

Question 4

A neutral atom must have ____.

Accepted Answer

A)  an equal number of protons and neutrons 
B)  an equal number of protons and electrons 
C)  an equal number of neutrons and electrons 
D)  fewer electrons than protons 
E)  more electrons than neutrons 
A)  an equal number of protons and neutrons 
B)  an equal number of protons and electrons 
C)  an equal number of neutrons and electrons 
D)  fewer electrons than protons 
E)  more electrons than neutrons

Question 5

A spectrum that displays a smooth variation in intensity over a range of wavelengths with breaks where no energy is observed at specific wavelengths is a(n) ____ spectrum.

Accepted Answer

A)  absorption 
B)  emission 
C)  continuous 
D)  Doppler 
E)  ionization 
A)  absorption 
B)  emission 
C)  continuous 
D)  Doppler 
E)  ionization

Question 6

Blackbody radiation is caused by an object's ____.

Accepted Answer

A)  chemical structure 
B)  binding energy 
C)  excitation level 
D)  absolute zero 
E)  thermal agitation 
A)  chemical structure 
B)  binding energy 
C)  excitation level 
D)  absolute zero 
E)  thermal agitation

Question 7

An absorption spectrum is created when blackbody radiation passes through a cool gas.

Accepted Answer

A) True 
 B)False

Question 8

In blackbody radiation, short-wavelength and long-wavelength photons are rare.

Accepted Answer

A) True 
 B)False

Question 9

The arrangement of permitted orbits is ____.

Accepted Answer

A)  the same for each neutron 
B)  unique for each electron 
C)  the same for all elements 
D)  the same for all molecules 
E)  unique for each element 
A)  the same for each neutron 
B)  unique for each electron 
C)  the same for all elements 
D)  the same for all molecules 
E)  unique for each element

Question 10

The _______________ effect changes the observed wavelength of an emitted photon if the source is moving toward or away from the observer.

Accepted Answer

The answer of The _______________ effect changes the observed wavelength...

Question 11

What is binding energy, and what physical effect causes it?

Accepted Answer

Binding energy is the amount of energy n

Question 12

The position of an absorption or emission line is useful in determining the ____.

Accepted Answer

A)  temperature of an object 
B)  distance to an object 
C)  chemical composition of an object 
D)  motion of an object across the observer's line of sight 
E)  motion of an object toward or away from the observer 
A)  temperature of an object 
B)  distance to an object 
C)  chemical composition of an object 
D)  motion of an object across the observer's line of sight 
E)  motion of an object toward or away from the observer

Question 13

A spectrum that displays a smooth variation in intensity of all wavelengths without any breaks is a(n) ____ spectrum.

Accepted Answer

A)  absorption 
B)  emission 
C)  continuous 
D)  Doppler 
E)  ionization 
A)  absorption 
B)  emission 
C)  continuous 
D)  Doppler 
E)  ionization

Question 14

Physicists and astronomers usually refer to the permitted orbits of an atom as the atom's _______________ levels.

Accepted Answer

The answer of Physicists and astronomers usually refer to the...

Question 15

An object that acts as a blackbody emits photons because ____.

Accepted Answer

A)  thermal energy excites electrons to the ground state 
B)  electrons in the atoms of the object jump to lower energy levels 
C)  electrons in the atoms of the object jump to higher energy levels 
D)  atoms in the object collide, changing the motion of charged particles 
E)  atoms in the object have absorbed photons from an external source 
A)  thermal energy excites electrons to the ground state 
B)  electrons in the atoms of the object jump to lower energy levels 
C)  electrons in the atoms of the object jump to higher energy levels 
D)  atoms in the object collide, changing the motion of charged particles 
E)  atoms in the object have absorbed photons from an external source

Question 16

Emission lines are produced by ____.

Accepted Answer

A)  atoms that become ionized 
B)  electrons that transfer from a high energy level to a low energy level 
C)  electrons that transfer from a low energy level to a high energy level 
D)  the intensity of agitation of atoms in a hot gas 
E)  the motion of an object toward or away from the observer 
A)  atoms that become ionized 
B)  electrons that transfer from a high energy level to a low energy level 
C)  electrons that transfer from a low energy level to a high energy level 
D)  the intensity of agitation of atoms in a hot gas 
E)  the motion of an object toward or away from the observer

Question 17

The binding energy is the amount of energy ____.

Accepted Answer

A)  needed to pull a proton completely away from the nucleus 
B)  needed to pull an electron completely away from the nucleus 
C)  needed to push a neutron into the nucleus 
D)  needed to completely separate all particles in the atom 
E)  necessary to move a proton to a permitted orbit 
A)  needed to pull a proton completely away from the nucleus 
B)  needed to pull an electron completely away from the nucleus 
C)  needed to push a neutron into the nucleus 
D)  needed to completely separate all particles in the atom 
E)  necessary to move a proton to a permitted orbit

Question 18

The NASA Curiosity rover exploring Mars carries a number of scientific instruments, including a spectrograph (a device for recording a spectrum) , and a high-intensity laser. On several occasions, Curiosity has fired its laser at the surface of a rock sample, while observing the process with a spectroscope. The laser is intense enough to vaporize the atoms on the surface of the sample into a hot, excited gas. 
Why is this a useful technique for the rover to employ?

Accepted Answer

The vaporized material will contain the

Question 19

The formula     expresses the relationship between Kelvin temperature and the amount of radiated energy. If a star is three times the temperature of the Sun, how many times more intense is the energy radiated from an equal-sized area of its surface? (Answer with a number only.

Accepted Answer

The answer of The formula     expresses the...

Question 20

The type of elements present in a gas can be determined by studying the ____.

Accepted Answer

A)  number of ionized atoms in the gas 
B)  energy of the electrons being emitted by the gas 
C)  number of photons being absorbed or emitted by the gas 
D)  wavelengths of photons absorbed or emitted from the gas 
E)  number of excited atoms in the gas 
A)  number of ionized atoms in the gas 
B)  energy of the electrons being emitted by the gas 
C)  number of photons being absorbed or emitted by the gas 
D)  wavelengths of photons absorbed or emitted from the gas 
E)  number of excited atoms in the gas

The number of protons in the nucleus determines which element it is.

If λ = 2.90 × 10⁶/ T expresses the relationship between Kelvin temperature and the wavelength of maximum intensity in nanometers, what is the wavelength in nanometers of maximum intensity for a star with a surface temperature of 7 250 K?

A spectrum that displays no energy except at very specific wavelengths where intense radiation is observed is a(n) ____ spectrum.

A neutral atom must have ____.

A spectrum that displays a smooth variation in intensity over a range of wavelengths with breaks where no energy is observed at specific wavelengths is a(n) ____ spectrum.

Blackbody radiation is caused by an object's ____.

An absorption spectrum is created when blackbody radiation passes through a cool gas.

In blackbody radiation, short-wavelength and long-wavelength photons are rare.

The arrangement of permitted orbits is ____.

The _______________ effect changes the observed wavelength of an emitted photon if the source is moving toward or away from the observer.

What is binding energy, and what physical effect causes it?

The position of an absorption or emission line is useful in determining the ____.

A spectrum that displays a smooth variation in intensity of all wavelengths without any breaks is a(n) ____ spectrum.

Physicists and astronomers usually refer to the permitted orbits of an atom as the atom's _______________ levels.

An object that acts as a blackbody emits photons because ____.

Emission lines are produced by ____.

The binding energy is the amount of energy ____.

The formula expresses the relationship between Kelvin temperature and the amount of radiated energy. If a star is three times the temperature of the Sun, how many times more intense is the energy radiated from an equal-sized area of its surface? (Answer with a number only.

The type of elements present in a gas can be determined by studying the ____.

Here and Now

A User S Guide to the Sky

Moon Phases and Eclipses

Origins of Modern Astronomy

Gravity

Light and Telescopes

The Sun

Origin of the Solar System and Extrasolar Planets

Earth the Active Planet

The Moon and Mercury: Comparing Airless Worlds

Venus and Mars

Jupiter and Saturn

Uranus Neptune Pluto and the Kuiper Belt

Meteorites Asteroids and Comets

Astrobiology: Life on Other Worlds

Filters

Exam 7: Atoms and Spectra

The number of protons in the nucleus determines which element it is.

If λ = 2.90 × 106/ T expresses the relationship between Kelvin temperature and the wavelength of maximum intensity in nanometers, what is the wavelength in nanometers of maximum intensity for a star with a surface temperature of 7 250 K?

A spectrum that displays no energy except at very specific wavelengths where intense radiation is observed is a(n) ____ spectrum.

A neutral atom must have ____.

A spectrum that displays a smooth variation in intensity over a range of wavelengths with breaks where no energy is observed at specific wavelengths is a(n) ____ spectrum.

Blackbody radiation is caused by an object's ____.

An absorption spectrum is created when blackbody radiation passes through a cool gas.

In blackbody radiation, short-wavelength and long-wavelength photons are rare.

The arrangement of permitted orbits is ____.

The _______________ effect changes the observed wavelength of an emitted photon if the source is moving toward or away from the observer.

What is binding energy, and what physical effect causes it?

The position of an absorption or emission line is useful in determining the ____.

A spectrum that displays a smooth variation in intensity of all wavelengths without any breaks is a(n) ____ spectrum.

Physicists and astronomers usually refer to the permitted orbits of an atom as the atom's _______________ levels.

An object that acts as a blackbody emits photons because ____.

Emission lines are produced by ____.

The binding energy is the amount of energy ____.

The formula expresses the relationship between Kelvin temperature and the amount of radiated energy. If a star is three times the temperature of the Sun, how many times more intense is the energy radiated from an equal-sized area of its surface? (Answer with a number only.

The type of elements present in a gas can be determined by studying the ____.

Here and Now

A User S Guide to the Sky

Moon Phases and Eclipses

Origins of Modern Astronomy

Gravity

Light and Telescopes

The Sun

Origin of the Solar System and Extrasolar Planets

Earth the Active Planet

The Moon and Mercury: Comparing Airless Worlds

Venus and Mars

Jupiter and Saturn

Uranus Neptune Pluto and the Kuiper Belt

Meteorites Asteroids and Comets

Astrobiology: Life on Other Worlds

Filters

If λ = 2.90 × 10⁶/ T expresses the relationship between Kelvin temperature and the wavelength of maximum intensity in nanometers, what is the wavelength in nanometers of maximum intensity for a star with a surface temperature of 7 250 K?