Question 1

The wavelength of maximum intensity is useful in measuring the ____.

Accepted Answer

A)  surface temperatures of an object from their colors 
B)  distance to an object from their colors 
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)  surface temperatures of an object from their colors 
B)  distance to an object from their colors 
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 2

The Stefan-Boltzmann law relates the ____.

Accepted Answer

A)  energy emitted from a surface every second to the temperature of the surface 
B)  wavelength of peak intensity to the Kelvin temperature 
C)  binding energy to the Coulomb force 
D)  difference in energy level to the wavelength of the emitted photon 
E)  observed wavelength to the velocity of the object 
A)  energy emitted from a surface every second to the temperature of the surface 
B)  wavelength of peak intensity to the Kelvin temperature 
C)  binding energy to the Coulomb force 
D)  difference in energy level to the wavelength of the emitted photon 
E)  observed wavelength to the velocity of the object

Question 3

An astronomer records the spectrum of light coming from a distant star. Describe what information the astronomer can deduce from this stellar spectrum, and what physical principles she would apply.

Accepted Answer

The spectrum of light from a star will b

Question 4

A hot object that is glowing orange will become redder as it cools.

Accepted Answer

A) True 
 B)False

Question 5

Law enforcement officers use radar guns based on the Doppler effect to measure the speed of automobiles. Explain why the details of the Doppler effect make it desirable for the officers to park near the road in a place without curves.

Accepted Answer

The Doppler effect uses a measured chang

Question 6

An atom that has gained one or more electrons is called an isotope.

Accepted Answer

A) True 
 B)False

Question 7

If you move an electron from the ground state to a higher energy level, the atom becomes an excited atom.

Accepted Answer

A) True 
 B)False

Question 8

A(n) _______________ spectrum is produced by a hot, excited gas.

Accepted Answer

The answer of A(n) _______________ spectrum is produced by a...

Question 9

Atoms are mostly empty space.

Accepted Answer

A) True 
 B)False

Question 10

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

Question 11

Name the three subatomic particles that make up an atom and state their electrical charges

Accepted Answer

Protons - have a pos

Question 12

The particle in an atom that carries a negative charge is the ____.

Accepted Answer

A)  nucleon 
B)  electron 
C)  negatron 
D)  proton 
E)  neutron 
A)  nucleon 
B)  electron 
C)  negatron 
D)  proton 
E)  neutron

Question 13

If $\lambda _ { m \partial x } = 2.90 \times 10 ^ { 6 } / T$  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 7,250K?

Accepted Answer

400,400 nm

Question 14

The _______________ temperature scale is used in astronomy because it is based on absolute zero.

Accepted Answer

The answer of The _______________ temperature scale is used in...

Question 15

The photons coming from blackbody radiation create a(n) ____ spectrum.

Accepted Answer

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

Question 16

An object that is a perfect absorber and emitter of radiation is called a(n) _______________.

Accepted Answer

blackbody,

Question 17

The Doppler formula states that the ratio of the velocity of a source to the speed of light is equal to the ratio of the change in wavelength caused by the Doppler shift to the source wavelength, or $\frac { \gamma } { c } = \frac { \Delta \lambda } { \lambda }$ 
A spacecraft has yellow headlights which radiate 600nm photons, and is travelling toward a stationary observer. If the spacecraft is travelling at a velocity of 1% of the speed of light (0.01c), what will be the amount of the shift in wavelength observed (in nanometers)?

Accepted Answer

The answer of The Doppler formula states that the ratio...

Question 18

Electromagnetic waves are generated whenever the ____.

Accepted Answer

A)  motion of any particle is changed 
B)  motion of any charged particle changes 
C)  motion of a positively charged particle is changed 
D)  motion of a negatively charged particle is changed 
E)  acceleration of any charged particle is changed 
A)  motion of any particle is changed 
B)  motion of any charged particle changes 
C)  motion of a positively charged particle is changed 
D)  motion of a negatively charged particle is changed 
E)  acceleration of any charged particle is changed

Question 19

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 20

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)  less 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)  less electrons than protons 
E)  more electrons than neutrons

Exam 7: Atoms and Spectra

The wavelength of maximum intensity is useful in measuring the ____.

The Stefan-Boltzmann law relates the ____.

An astronomer records the spectrum of light coming from a distant star. Describe what information the astronomer can deduce from this stellar spectrum, and what physical principles she would apply.

A hot object that is glowing orange will become redder as it cools.

Law enforcement officers use radar guns based on the Doppler effect to measure the speed of automobiles. Explain why the details of the Doppler effect make it desirable for the officers to park near the road in a place without curves.

An atom that has gained one or more electrons is called an isotope.

If you move an electron from the ground state to a higher energy level, the atom becomes an excited atom.

A(n) _______________ spectrum is produced by a hot, excited gas.

Atoms are mostly empty space.

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

Name the three subatomic particles that make up an atom and state their electrical charges

The particle in an atom that carries a negative charge is the ____.

The _______________ temperature scale is used in astronomy because it is based on absolute zero.

The photons coming from blackbody radiation create a(n) ____ spectrum.

An object that is a perfect absorber and emitter of radiation is called a(n) _______________.

Electromagnetic waves are generated whenever the ____.

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

A neutral atom must have ____.

Here and Now

A Users Guide to the Sky

Moon Phases and Eclipses

Origins of Modern Astronomy

Gravity

Light and Telescopes

The Sun

The Family of Stars

The Interstellar Medium

Formation and Structure of Stars

Stellar Evolution

Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies

Supermassive Black Holes and Active Galaxies

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth the Active Planet

The Moon and Mercury

Venus and Mars

Jupiter and Saturn

Uranus Neptune Pluto and the Kuiper Belt

Meteorites Asteroids and Comets

Astrobiology

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