Question 1

An atom that is excited

Accepted Answer

A)  is also ionized. 
B)  is an isotope. 
C)  has had its electron moved to the lowest energy level. 
D)  can emit a photon when the electron moves to a lower energy level. 
E)  can emit a photon when the electron moves to a higher energy level. 
A)  is also ionized. 
B)  is an isotope. 
C)  has had its electron moved to the lowest energy level. 
D)  can emit a photon when the electron moves to a lower energy level. 
E)  can emit a photon when the electron moves to a higher energy level.

Question 2

An excited atom lost an electron from the atom to its surroundings.

Accepted Answer

A) True 
 B)False

Question 3

The radiation emitted from a star has a maximum intensity at a wavelength of 300 nm. What is the temperature of this star?

Accepted Answer

A)  300 K 
B)  100 K 
C)  900,000,000 K 
D)  90,000 K 
E)  10,000 K 
A)  300 K 
B)  100 K 
C)  900,000,000 K 
D)  90,000 K 
E)  10,000 K

Question 4

The ____ of a gas is a measure of the average speed of the particles (atoms or molecules) in the gas.

Accepted Answer

A)  heat 
B)  composition 
C)  temperature 
D)  blue shift 
E)  binding energy 
A)  heat 
B)  composition 
C)  temperature 
D)  blue shift 
E)  binding energy

Question 5

Describe the appearance of each of the three types of spectra described by Kirchhoff's laws. Describe how each of the three types of spectra is formed.

Accepted Answer

(1) A hot solid, liquid, or dense gas em

Question 6

Why should photons emitted by a hotter gas have, on average, shorter wavelengths than photons emitted by a cooler gas?

Accepted Answer

The wavelength of photons emit

Question 7

An absorption spectrum is also called a bright-line spectrum.

Accepted Answer

A) True 
 B)False

Question 8

The nucleus of the hydrogen atom consists of a single neutron.

Accepted Answer

A) True 
 B)False

Question 9

A blackbody emits a continuous spectrum.

Accepted Answer

A) True 
 B)False

Question 10

An atom can be ionized by ____ it.

Accepted Answer

A)  removing electrons from 
B)  adding an electron to 
C)  removing a proton from 
D)  Either removing electron from or and adding an electron to 
A)  removing electrons from 
B)  adding an electron to 
C)  removing a proton from 
D)  Either removing electron from or and adding an electron to

Question 11

Two white dwarf stars are the same size, but one has a surface temperature twice as hot as the other. The hotter star will radiate

Accepted Answer

A)  half as much energy per second as the cooler star. 
B)  the same amount of energy per second as the cooler star. 
C)  four times as much energy per second as the cooler star. 
D)  sixteen times as much energy per second as the cooler star. 
A)  half as much energy per second as the cooler star. 
B)  the same amount of energy per second as the cooler star. 
C)  four times as much energy per second as the cooler star. 
D)  sixteen times as much energy per second as the cooler star.

Question 12

____ is a set of rules that describes how atoms and subatomic particles behave.

Accepted Answer

A)  Kirchhoff's law 
B)  Blackbody radiation law 
C)  The Coulomb force 
D)  Quantum mechanics 
E)  The binding energy 
A)  Kirchhoff's law 
B)  Blackbody radiation law 
C)  The Coulomb force 
D)  Quantum mechanics 
E)  The binding energy

Question 13

A 50-K dense cloud is a blackbody.

Accepted Answer

A) True 
 B)False

Question 14

In the above model of an atom, if you were to draw an electron's transition from the second excited state to the third excited state, what numbers would this correspond from/to? What kind of spectrum would be produced?

Accepted Answer

A)  3 to 4, absorption 
B)  2 to 3, absorption 
C)  3 to 4, emission 
D)  2 to 3, emission 
A)  3 to 4, absorption 
B)  2 to 3, absorption 
C)  3 to 4, emission 
D)  2 to 3, emission

Question 15

Which spectrum is shown above?

Accepted Answer

A)  emission 
B)  absorption 
C)  blackbody 
D)  None of the other choices are correct. 
A)  emission 
B)  absorption 
C)  blackbody 
D)  None of the other choices are correct.

Question 16

Suppose the laboratory wavelength of a spectral line is 600 nm. In a star it is measured to be 599.4 nm. Is the star moving toward or away from us, relative to the line of sight? How fast is it moving? (Hint: c = 300,000 km/s)

Accepted Answer

A)  toward; 300 km/s 
B)  away; 300 km/s 
C)  at rest; 0 km/s 
D)  sideways; 300 km/s 
E)  toward; 150 km/s 
A)  toward; 300 km/s 
B)  away; 300 km/s 
C)  at rest; 0 km/s 
D)  sideways; 300 km/s 
E)  toward; 150 km/s

Question 17

The bluer the light, the ____ each photon contains.

Accepted Answer

A)  more energy 
B)  less energy 
C)  less speed 
D)  more speed 
E)  none of the above 
A)  more energy 
B)  less energy 
C)  less speed 
D)  more speed 
E)  none of the above

Question 18

One star has a temperature of 10,000 K and another star has a temperature of 5,000 K. Compared to the cooler star, how much more energy per second will the hotter star radiate from each square meter of its surface?

Accepted Answer

A)  16 times 
B)  2 times 
C)  1 × 1016 times 
D)  625 times 
E)  25 times 
A)  16 times 
B)  2 times 
C)  1 × 1016 times 
D)  625 times 
E)  25 times

Question 19

At what wavelength would a star radiate the greatest amount of energy if the star has a surface temperature of 60,000 K?

Accepted Answer

A)  50 nm 
B)  500 nm 
C)  300 nm 
D)  1.8 × 1011 nm 
E)  180 nm 
A)  50 nm 
B)  500 nm 
C)  300 nm 
D)  1.8 × 1011 nm 
E)  180 nm

Question 20

If a light-emitting object is moving away from you, you observe its wavelengths to be ________ its wavelengths if it were at rest.

Accepted Answer

A)  longer than 
B)  shorter than 
C)  the same as 
A)  longer than 
B)  shorter than 
C)  the same as

An atom that is excited

An excited atom lost an electron from the atom to its surroundings.

The radiation emitted from a star has a maximum intensity at a wavelength of 300 nm. What is the temperature of this star?

The ____ of a gas is a measure of the average speed of the particles (atoms or molecules) in the gas.

Describe the appearance of each of the three types of spectra described by Kirchhoff's laws. Describe how each of the three types of spectra is formed.

Why should photons emitted by a hotter gas have, on average, shorter wavelengths than photons emitted by a cooler gas?

An absorption spectrum is also called a bright-line spectrum.

The nucleus of the hydrogen atom consists of a single neutron.

A blackbody emits a continuous spectrum.

An atom can be ionized by ____ it.

Two white dwarf stars are the same size, but one has a surface temperature twice as hot as the other. The hotter star will radiate

____ is a set of rules that describes how atoms and subatomic particles behave.

A 50-K dense cloud is a blackbody.

In the above model of an atom, if you were to draw an electron's transition from the second excited state to the third excited state, what numbers would this correspond from/to? What kind of spectrum would be produced?

Which spectrum is shown above?

Suppose the laboratory wavelength of a spectral line is 600 nm. In a star it is measured to be 599.4 nm. Is the star moving toward or away from us, relative to the line of sight? How fast is it moving? (Hint: c = 300,000 km/s)

The bluer the light, the ____ each photon contains.

One star has a temperature of 10,000 K and another star has a temperature of 5,000 K. Compared to the cooler star, how much more energy per second will the hotter star radiate from each square meter of its surface?

At what wavelength would a star radiate the greatest amount of energy if the star has a surface temperature of 60,000 K?

If a light-emitting object is moving away from you, you observe its wavelengths to be ________ its wavelengths if it were at rest.

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

The Sun

The Family of Stars

The Formation and Structure of Stars

The Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies: Normal and Active

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters

Exam 6: Atoms and Spectra

An atom that is excited

An excited atom lost an electron from the atom to its surroundings.

The radiation emitted from a star has a maximum intensity at a wavelength of 300 nm. What is the temperature of this star?

The ____ of a gas is a measure of the average speed of the particles (atoms or molecules) in the gas.

Describe the appearance of each of the three types of spectra described by Kirchhoff's laws. Describe how each of the three types of spectra is formed.

Why should photons emitted by a hotter gas have, on average, shorter wavelengths than photons emitted by a cooler gas?

An absorption spectrum is also called a bright-line spectrum.

The nucleus of the hydrogen atom consists of a single neutron.

A blackbody emits a continuous spectrum.

An atom can be ionized by ____ it.

Two white dwarf stars are the same size, but one has a surface temperature twice as hot as the other. The hotter star will radiate

____ is a set of rules that describes how atoms and subatomic particles behave.

A 50-K dense cloud is a blackbody.

In the above model of an atom, if you were to draw an electron's transition from the second excited state to the third excited state, what numbers would this correspond from/to? What kind of spectrum would be produced?

Which spectrum is shown above?

Suppose the laboratory wavelength of a spectral line is 600 nm. In a star it is measured to be 599.4 nm. Is the star moving toward or away from us, relative to the line of sight? How fast is it moving? (Hint: c = 300,000 km/s)

The bluer the light, the ____ each photon contains.

One star has a temperature of 10,000 K and another star has a temperature of 5,000 K. Compared to the cooler star, how much more energy per second will the hotter star radiate from each square meter of its surface?

At what wavelength would a star radiate the greatest amount of energy if the star has a surface temperature of 60,000 K?

If a light-emitting object is moving away from you, you observe its wavelengths to be ________ its wavelengths if it were at rest.

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

The Sun

The Family of Stars

The Formation and Structure of Stars

The Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies: Normal and Active

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters