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ASTR 1000 UNIT 1 ACTUAL
QUESTIONS 2026 WITH VERIFIED
ANSWERS.
Normal human body temperature is 310K. What is the
wavelength of maximum emission for the thermal radiation from
this object? - correct answer-9.35×10 3 nm
I look at the spectrum of a piece of metal and find that the
strongest emissions are at a wavelength of 276 nm. What is the
temperature of this object? - correct answer-1.05×10 4 K
Identify the following statements about spectroscopy as either
TRUE or FALSE.
The wavelengths of the emission and absorption lines in an
atom depend on the spacing of the electron energy levels
inside the atom.
Inside an atom, electrons can only be in specific energy states
that depend on the number of protons, neutrons, and electrons
in the atom.
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Inside an atom, when an electron absorbs a photon (with the
right amount of energy) it will jump from a low to a high energy
level.
The electrons in an ion of calcium (such as Ca+ or Ca+2) have
electron energy levels that are different than what you find in
neutral calcium, and hence, they have different emission and
absorption lines.
The emission lines and the absorption lines for a particular
atom occur at slightly different wavelengths.
The emission and absorption lines of different elements will
occur at different wavelengths. - correct answer-T, T, T, T, F, T
Which of the following best describes why the Sun's spectrum
contains black lines over an underlying rainbow?
A)The rainbow of colors are emissions by many different
chemical elements; the black lines represent wavelengths
where no elements emit light.
B) Since no spectral measurement device is perfect, the black
lines are simply noise in the measurement.
C) The Sun's hot interior produces a continuous spectrum of all
of the colors, but cooler gases at the surface absorbs light at
particular wavelengths (and re-emits them in different
directions).
D) The dark lines are caused by Doppler shifts in the solar
material.
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E) The Sun produces a smooth, continuous rainbow of color,
while the black lines are caused by atoms in the Earth's
atmosphere. If you observe the Sun outside of the atmosphere,
all of the black lines go away. - correct answer-C) The Sun's hot
interior produces a continuous spectrum of all of the colors, but
cooler gases at the surface absorbs light at particular
wavelengths (and re-emits them in different directions).
Which statements below are TRUE about an absorption
spectrum? Check ALL that apply
.
An absorption spectrum consists of discrete bright lines on a
dark background.
Whatever material is absorbing the light must also re-emit the
light somehow - either at the same wavelengths (but different,
random directions) or at other wavelengths as the electrons
cascade down towards the ground states.
The source of light that would produce an absorption spectrum
may be a combination of a continuous source and some low
density or thin material between us and the continuous source.
The wavelengths of light that appear in an absorption spectrum
are completely determined by the number of protons and
neutrons in the nucleus and the configuration of the electrons in
the atoms of the absorbing material.
An absorption spectrum contains discrete dark lines
superimposed on a smooth colorful background of light. -
correct answer-F, T, T, T, T
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Which statements below are TRUE about an emission
spectrum? Select all that apply.
If an object is emitting light, the spectrum of that light is an
emission spectrum.
An emission line spectrum consists of discrete bright lines on a
dark background.
The wavelengths of light that appear in an emission spectrum
are completely determined by the number of protons and
neutrons in the nucleus and the configuration of the electrons in
the atoms of the source.
The source of light that would produce an emission spectrum
is only emitting light at certain discrete wavelengths.
The wavelengths of light that appear in an emission spectrum
are determined by the temperature of the source; at different
temperatures, these lines would appear at different places.
An emission line spectrum contains discrete dark lines
superimposed on a smooth colorful background of light. -
correct answer-F, T, T, T, F, F
In ________ the atoms act independently and there are only a
small number of electron energy transitions possible, so you
get ____________. In _________ the atoms interact with each
other and there are a huge number of possible energy
transitions, so you get __________.
ASTR 1000 UNIT 1 ACTUAL
QUESTIONS 2026 WITH VERIFIED
ANSWERS.
Normal human body temperature is 310K. What is the
wavelength of maximum emission for the thermal radiation from
this object? - correct answer-9.35×10 3 nm
I look at the spectrum of a piece of metal and find that the
strongest emissions are at a wavelength of 276 nm. What is the
temperature of this object? - correct answer-1.05×10 4 K
Identify the following statements about spectroscopy as either
TRUE or FALSE.
The wavelengths of the emission and absorption lines in an
atom depend on the spacing of the electron energy levels
inside the atom.
Inside an atom, electrons can only be in specific energy states
that depend on the number of protons, neutrons, and electrons
in the atom.
, Page | 2
Inside an atom, when an electron absorbs a photon (with the
right amount of energy) it will jump from a low to a high energy
level.
The electrons in an ion of calcium (such as Ca+ or Ca+2) have
electron energy levels that are different than what you find in
neutral calcium, and hence, they have different emission and
absorption lines.
The emission lines and the absorption lines for a particular
atom occur at slightly different wavelengths.
The emission and absorption lines of different elements will
occur at different wavelengths. - correct answer-T, T, T, T, F, T
Which of the following best describes why the Sun's spectrum
contains black lines over an underlying rainbow?
A)The rainbow of colors are emissions by many different
chemical elements; the black lines represent wavelengths
where no elements emit light.
B) Since no spectral measurement device is perfect, the black
lines are simply noise in the measurement.
C) The Sun's hot interior produces a continuous spectrum of all
of the colors, but cooler gases at the surface absorbs light at
particular wavelengths (and re-emits them in different
directions).
D) The dark lines are caused by Doppler shifts in the solar
material.
, Page | 3
E) The Sun produces a smooth, continuous rainbow of color,
while the black lines are caused by atoms in the Earth's
atmosphere. If you observe the Sun outside of the atmosphere,
all of the black lines go away. - correct answer-C) The Sun's hot
interior produces a continuous spectrum of all of the colors, but
cooler gases at the surface absorbs light at particular
wavelengths (and re-emits them in different directions).
Which statements below are TRUE about an absorption
spectrum? Check ALL that apply
.
An absorption spectrum consists of discrete bright lines on a
dark background.
Whatever material is absorbing the light must also re-emit the
light somehow - either at the same wavelengths (but different,
random directions) or at other wavelengths as the electrons
cascade down towards the ground states.
The source of light that would produce an absorption spectrum
may be a combination of a continuous source and some low
density or thin material between us and the continuous source.
The wavelengths of light that appear in an absorption spectrum
are completely determined by the number of protons and
neutrons in the nucleus and the configuration of the electrons in
the atoms of the absorbing material.
An absorption spectrum contains discrete dark lines
superimposed on a smooth colorful background of light. -
correct answer-F, T, T, T, T
, Page | 4
Which statements below are TRUE about an emission
spectrum? Select all that apply.
If an object is emitting light, the spectrum of that light is an
emission spectrum.
An emission line spectrum consists of discrete bright lines on a
dark background.
The wavelengths of light that appear in an emission spectrum
are completely determined by the number of protons and
neutrons in the nucleus and the configuration of the electrons in
the atoms of the source.
The source of light that would produce an emission spectrum
is only emitting light at certain discrete wavelengths.
The wavelengths of light that appear in an emission spectrum
are determined by the temperature of the source; at different
temperatures, these lines would appear at different places.
An emission line spectrum contains discrete dark lines
superimposed on a smooth colorful background of light. -
correct answer-F, T, T, T, F, F
In ________ the atoms act independently and there are only a
small number of electron energy transitions possible, so you
get ____________. In _________ the atoms interact with each
other and there are a huge number of possible energy
transitions, so you get __________.
