Question 1

The Kelvin temperature scale is used in astronomy because

Accepted Answer

A)  at 0 K an object has zero thermal energy. 
B)  water freezes at 0 K. 
C)  water boils at 100 K. 
D)  hydrogen freezes at 0 K. 
E)  the highest temperature possible is 1000 K. 
A)  at 0 K an object has zero thermal energy. 
B)  water freezes at 0 K. 
C)  water boils at 100 K. 
D)  hydrogen freezes at 0 K. 
E)  the highest temperature possible is 1000 K.

Question 2

Explain what the term ground state means.

Accepted Answer

The ground state is

Question 3

A spaceship is traveling at a speed of 15,000 km/s from planet "B" toward planet "A." The spaceship sends out a signal with a wavelength of 4 m.If astronomers living on planets A and B measure the radio waves coming from the spaceship, what wavelengths will they measure?

Accepted Answer

A)  Planet A measures 6 m, and planet B measures 2 m. 
B)  Planet A measures 2 m, and planet B measures 6 m. 
C)  Planet A measures 4.2 m, and planet B measures 3.8 m. 
D)  Planet A measures 3.8 m, and planet B measures 4.2 m. 
E)  Both Planet A and planet B measure 4 m. 
A)  Planet A measures 6 m, and planet B measures 2 m. 
B)  Planet A measures 2 m, and planet B measures 6 m. 
C)  Planet A measures 4.2 m, and planet B measures 3.8 m. 
D)  Planet A measures 3.8 m, and planet B measures 4.2 m. 
E)  Both Planet A and planet B measure 4 m.

Question 4

If a star has a peak wavelength of 290 nm, what is its surface temperature?

Accepted Answer

A)  1000 K 
B)  2000 K 
C)  5000 K 
D)  10,000 K 
E)  100,000 K 
A)  1000 K 
B)  2000 K 
C)  5000 K 
D)  10,000 K 
E)  100,000 K

Question 5

If you observe the spectrum of a star, you will see

Accepted Answer

A)  an absorption spectrum. 
B)  a continuous spectrum. 
C)  an emission spectrum. 
D)  a rainbow spectrum. 
E)  a dark spectrum. 
A)  an absorption spectrum. 
B)  a continuous spectrum. 
C)  an emission spectrum. 
D)  a rainbow spectrum. 
E)  a dark spectrum.

Question 6

If you want a blackbody's peak wavelength to be cut in half, by how much do you need to increase its temperature?

Accepted Answer

Wien's law states that @#LAT-DLM&_peak =

Question 7

Compare the differences between a photon of red light and a photon of blue light.

Accepted Answer

Red and blue photons both trav

Question 8

Which of the following photons carries the smallest amount of energy?

Accepted Answer

A)  a blue photon of the visible spectrum, whose wavelength is 450 nm 
B)  an infrared photon, whose wavelength is 10-5 m 
C)  a red photon in the visible spectrum, whose wavelength is 700 nm 
D)  a microwave photon, whose wavelength is 10-2 m 
E)  an ultraviolet photon, whose wavelength is 300 nm 
A)  a blue photon of the visible spectrum, whose wavelength is 450 nm 
B)  an infrared photon, whose wavelength is 10-5 m 
C)  a red photon in the visible spectrum, whose wavelength is 700 nm 
D)  a microwave photon, whose wavelength is 10-2 m 
E)  an ultraviolet photon, whose wavelength is 300 nm

Question 9

What wavelengths of light can the human eye see?

Accepted Answer

A)  3.8-7.5 $\mu$m 
B)  3.8-7.5 nm 
C)  380-750 cm 
D)  380-750 nm 
E)  3.8-7.5 m 
A)  3.8-7.5 $\mu$m 
B)  3.8-7.5 nm 
C)  380-750 cm 
D)  380-750 nm 
E)  3.8-7.5 m

Question 10

Saying that something is quantized means that it

Accepted Answer

A)  is a wave. 
B)  can only be observed using a telescope. 
C)  travels at the speed of light. 
D)  can only have discrete quantities. 
E)  is smaller than an atom. 
A)  is a wave. 
B)  can only be observed using a telescope. 
C)  travels at the speed of light. 
D)  can only have discrete quantities. 
E)  is smaller than an atom.

Question 11

In the energy level diagram shown in the figure below, the electron is excited to the E2 energy level.If the atom absorbs a photon with the exact frequency to move the electron to another energy level, which energy level would correspond to the incoming photon with the largest frequency?

Accepted Answer

A)  E1 
B)  E2 
C)  E3 
D)  E4 
E)  E5 
A)  E1 
B)  E2 
C)  E3 
D)  E4 
E)  E5

Question 12

If Jupiter has a temperature of 165 K, at what wavelength does its spectrum peak? Use the electromagnetic spectrum in the figure below to answer this question.

Accepted Answer

A)  18 nm-orange visible wavelengths 
B)  1,800 mm-microwave wavelengths 
C)  1,800 nm-infrared wavelengths 
D)  18,000 nm-ultraviolet wavelengths 
E)  18,000 nm-infrared wavelengths 
A)  18 nm-orange visible wavelengths 
B)  1,800 mm-microwave wavelengths 
C)  1,800 nm-infrared wavelengths 
D)  18,000 nm-ultraviolet wavelengths 
E)  18,000 nm-infrared wavelengths

Question 13

The frequency of a wave is

Accepted Answer

A)  the total distance a wave travels 
B)  a measure of the wave's velocity. 
C)  the number of peaks that pass per second. 
D)  the maximum height of the wave above zero. 
E)  the distance between one peak value and the next peak. 
A)  the total distance a wave travels 
B)  a measure of the wave's velocity. 
C)  the number of peaks that pass per second. 
D)  the maximum height of the wave above zero. 
E)  the distance between one peak value and the next peak.

Question 14

________ measured the speed of light using the timing of Jupiter's moon.

Accepted Answer

A)  Galileo 
B)  Newton 
C)  Kepler 
D)  Rømer 
E)  Einstein 
A)  Galileo 
B)  Newton 
C)  Kepler 
D)  Rømer 
E)  Einstein

Question 15

Which of the following lists different types of electromagnetic radiation in order from the shortest wavelength to the longest wavelength?

Accepted Answer

A)  radio waves, infrared, visible, ultraviolet, X-rays 
B)  gamma rays, ultraviolet, visible, infrared, radio waves 
C)  gamma rays, X-rays, infrared, visible, ultraviolet 
D)  X-rays, infrared, visible, ultraviolet, radio waves 
E)  radio waves, ultraviolet, visible, infrared, gamma rays 
A)  radio waves, infrared, visible, ultraviolet, X-rays 
B)  gamma rays, ultraviolet, visible, infrared, radio waves 
C)  gamma rays, X-rays, infrared, visible, ultraviolet 
D)  X-rays, infrared, visible, ultraviolet, radio waves 
E)  radio waves, ultraviolet, visible, infrared, gamma rays

Question 16

The term quantum refers to

Accepted Answer

A)  anything that is very small. 
B)  a way of grouping small things together for mathematical convenience. 
C)  a single, smallest possible unit of some quantity. 
D)  uncertain, theoretical concepts. 
E)  something that behaves randomly. 
A)  anything that is very small. 
B)  a way of grouping small things together for mathematical convenience. 
C)  a single, smallest possible unit of some quantity. 
D)  uncertain, theoretical concepts. 
E)  something that behaves randomly.

Question 17

Explain how an emission line is formed, and why the pattern of lines is unique to a given element.

Accepted Answer

Emission lines are formed when an electr

Question 18

Compare two blackbody objects, one at 200 K and one at 400 K.How much larger is the flux from the 400 K object compared to the flux from the 200 K object?

Accepted Answer

A)  2 times larger 
B)  4 times larger 
C)  8 times larger 
D)  16 times larger 
E)  They have the same flux. 
A)  2 times larger 
B)  4 times larger 
C)  8 times larger 
D)  16 times larger 
E)  They have the same flux.

Question 19

What would you expect the temperature of a comet to be if its distance was 100 AU from the Sun? Assume that it is very icy and reflective so that its albedo is equal to 0.6.Does it matter what the radius of the comet is?

Accepted Answer

No,it does not matter what the radius of

Question 20

At what temperature does water freeze?

Accepted Answer

A)  0 K 
B)  32 K 
C)  100 K 
D)  273 K 
E)  373 K 
A)  0 K 
B)  32 K 
C)  100 K 
D)  273 K 
E)  373 K

Exam 5: Light

The Kelvin temperature scale is used in astronomy because

Explain what the term ground state means.

A spaceship is traveling at a speed of 15,000 km/s from planet "B" toward planet "A." The spaceship sends out a signal with a wavelength of 4 m.If astronomers living on planets A and B measure the radio waves coming from the spaceship, what wavelengths will they measure?

If a star has a peak wavelength of 290 nm, what is its surface temperature?

If you observe the spectrum of a star, you will see

If you want a blackbody's peak wavelength to be cut in half, by how much do you need to increase its temperature?

Compare the differences between a photon of red light and a photon of blue light.

Which of the following photons carries the smallest amount of energy?

What wavelengths of light can the human eye see?

Saying that something is quantized means that it

In the energy level diagram shown in the figure below, the electron is excited to the E2 energy level.If the atom absorbs a photon with the exact frequency to move the electron to another energy level, which energy level would correspond to the incoming photon with the largest frequency?

If Jupiter has a temperature of 165 K, at what wavelength does its spectrum peak? Use the electromagnetic spectrum in the figure below to answer this question.

The frequency of a wave is

________ measured the speed of light using the timing of Jupiter's moon.

Which of the following lists different types of electromagnetic radiation in order from the shortest wavelength to the longest wavelength?

The term quantum refers to

Explain how an emission line is formed, and why the pattern of lines is unique to a given element.

Compare two blackbody objects, one at 200 K and one at 400 K.How much larger is the flux from the 400 K object compared to the flux from the 200 K object?

What would you expect the temperature of a comet to be if its distance was 100 AU from the Sun? Assume that it is very icy and reflective so that its albedo is equal to 0.6.Does it matter what the radius of the comet is?

At what temperature does water freeze?

Thinking Like an Astronomer

Patterns in the Skymotions of Earth and the Moon

Motion of Astronomical Bodies

Gravity and Orbits

The Tools of the Astronomer

The Formation of Planetary Systems

The Terrestrial Planets and Earths Moon

Atmospheres of the Terrestrial Planets

Worlds of Gas and Liquidthe Giant Planets

Planetary Moons and Rings

Dwarf Planets and Small Solar System Bodies

Taking the Measure of Stars

Our Starthe Sun

The Interstellar Medium and Star Formation

Evolution of Low-Mass Stars

Evolution of High-Mass Stars

Relativity and Black Holes

Galaxies

The Milky Waya Normal Spiral Galaxy

The Expanding Universe

Cosmology

Large-Scale Structure in the Universe

Life

Filters

In the energy level diagram shown in the figure below, the electron is excited to the E₂ energy level.If the atom absorbs a photon with the exact frequency to move the electron to another energy level, which energy level would correspond to the incoming photon with the largest frequency?