Question 1

If a light source is approaching you at a speed very close to the speed of light,it will appear:

Accepted Answer

A)  redder than it is. 
B)  bluer than it is. 
C)  brighter than it is. 
D)  fainter than it is. 
E)  lower temperature than it is. 
A)  redder than it is. 
B)  bluer than it is. 
C)  brighter than it is. 
D)  fainter than it is. 
E)  lower temperature than it is.

Question 2

What two regions of the electromagnetic spectrum are best utilized by ground-based astronomers,and why?

Accepted Answer

The atmosphere is op

Question 3

How do Stefan's law and a knowledge of Earth's history tell us that the Sun's temperature cannot have varied much in the last 3.5 billion years?

Accepted Answer

Since even a small change in temperature

Question 4

An observer will measure the wavelength of waves emanating from a source that is moving away as longer than it really is.

Accepted Answer

A) True 
 B)False

Question 5

What are the similarities and differences between the Kelvin and Fahrenheit temperature scales? Identify the freezing point of water on both scales.

Accepted Answer

The Fahrenheit scale is an archaic scale

Question 6

X-rays travel at a greater speed than radio waves.

Accepted Answer

A) True 
 B)False

Question 7

Stars like our Sun emit most of their light in which part of the electromagnetic spectrum?

Accepted Answer

A)  the visible 
B)  the X-ray 
C)  the ultraviolet 
D)  the radio 
E)  the infrared 
A)  the visible 
B)  the X-ray 
C)  the ultraviolet 
D)  the radio 
E)  the infrared

Question 8

The visible color of electromagnetic radiation that has the shortest wavelength is:

Accepted Answer

A)  red. 
B)  orange. 
C)  green. 
D)  blue. 
E)  violet. 
A)  red. 
B)  orange. 
C)  green. 
D)  blue. 
E)  violet.

Question 9

Observations in the X-ray portion of the spectrum are routinely done from the surface of the Earth.

Accepted Answer

A) True 
 B)False

Question 10

The Sun's blackbody curve peaks in the ________ portion of the spectrum.

Accepted Answer

The answer of The Sun's blackbody curve peaks in the...

Question 11

While gravity is always attractive,electromagnetic forces are always repulsive.

Accepted Answer

A) True 
 B)False

Question 12

What information about a star can be inferred from its Doppler shift?

Accepted Answer

The Doppler shift gi

Question 13

Colors appear different to us because of their photons' different:

Accepted Answer

A)  speeds. 
B)  amplitudes. 
C)  frequencies. 
D)  magnetic fields. 
E)  polarization. 
A)  speeds. 
B)  amplitudes. 
C)  frequencies. 
D)  magnetic fields. 
E)  polarization.

Question 14

How do sound and light waves differ?

Accepted Answer

Sound waves travel much slower

Question 15

What is true of a blackbody?

Accepted Answer

A)  It appears black to us, regardless of its temperature. 
B)  Its energy is not a continuum. 
C)  Its energy peaks at the wavelength determined by its temperature. 
D)  If its temperature doubled, the peak in its curve would be doubled in wavelength. 
E)  It has a complete absence of thermal energy. 
A)  It appears black to us, regardless of its temperature. 
B)  Its energy is not a continuum. 
C)  Its energy peaks at the wavelength determined by its temperature. 
D)  If its temperature doubled, the peak in its curve would be doubled in wavelength. 
E)  It has a complete absence of thermal energy.

Question 16

What do infrared and ultraviolet waves have in common? How do they differ?

Accepted Answer

Both are forms of electromagnetic radiat

Question 17

Very low temperature molecular clouds emit most of their light in which part of the electromagnetic spectrum?

Accepted Answer

A)  the visible 
B)  the X-ray 
C)  the ultraviolet 
D)  the radio 
E)  the infrared 
A)  the visible 
B)  the X-ray 
C)  the ultraviolet 
D)  the radio 
E)  the infrared

Question 18

According to Wein's law,the higher the surface temperature of a star,the redder its color.

Accepted Answer

A) True 
 B)False

Question 19

Doubling the temperature of a black body will double the total energy it radiates.

Accepted Answer

A) True 
 B)False

Question 20

Electromagnetic radiation with a wavelength of 700 nm would be:

Accepted Answer

A)  X-rays. 
B)  red light. 
C)  violet light. 
D)  ultraviolet light. 
E)  microwaves. 
A)  X-rays. 
B)  red light. 
C)  violet light. 
D)  ultraviolet light. 
E)  microwaves.

Exam 3: Radiation: Information from the Cosmos

If a light source is approaching you at a speed very close to the speed of light,it will appear:

What two regions of the electromagnetic spectrum are best utilized by ground-based astronomers,and why?

How do Stefan's law and a knowledge of Earth's history tell us that the Sun's temperature cannot have varied much in the last 3.5 billion years?

An observer will measure the wavelength of waves emanating from a source that is moving away as longer than it really is.

What are the similarities and differences between the Kelvin and Fahrenheit temperature scales? Identify the freezing point of water on both scales.

X-rays travel at a greater speed than radio waves.

Stars like our Sun emit most of their light in which part of the electromagnetic spectrum?

The visible color of electromagnetic radiation that has the shortest wavelength is:

Observations in the X-ray portion of the spectrum are routinely done from the surface of the Earth.

The Sun's blackbody curve peaks in the ________ portion of the spectrum.

While gravity is always attractive,electromagnetic forces are always repulsive.

What information about a star can be inferred from its Doppler shift?

Colors appear different to us because of their photons' different:

How do sound and light waves differ?

What is true of a blackbody?

What do infrared and ultraviolet waves have in common? How do they differ?

Very low temperature molecular clouds emit most of their light in which part of the electromagnetic spectrum?

According to Wein's law,the higher the surface temperature of a star,the redder its color.

Doubling the temperature of a black body will double the total energy it radiates.

Electromagnetic radiation with a wavelength of 700 nm would be:

Charting the Heavens: The Foundations of Astronomy

The Copernican Revolution: The Birth of Modern Science

Spectroscopy: The Inner Workings of Atoms

Telescopes: The Tools of Astronomy

The Solar System: Comparative Planetology and Formation Models

Earth: Our Home in Space

The Moon and Mercury: Scorched and Battered Worlds

Venus: Earth's Sister Planet

Mars: A Near Miss for Life?

Jupiter: Giant of the Solar System

Saturn: Spectacular Rings and Mysterious Moons

Uranus and Neptune: The Outer Worlds of the Solar System

Solar System Debris: Keys to Our Origin

Exoplanets: Planetary Systems Beyond Our Own

The Sun: Our Parent Star

The Stars: Giants,Dwarfs,and the Main Sequence

The Interstellar Medium: Gas and Dust among the Stars

Star Formation: A Traumatic Birth

Stellar Evolution: The Life and Death of a Star

Stellar Explosions: Novae,Supernovae,and the Formation of the Elements

Neutron Stars and Black Holes: Strange States of Matter

The Milky Way Galaxy: A Spiral in Space

Galaxies: Building Blocks of the Universe

Galaxies and Dark Matter: The Large-Scale Structure of the Cosmos

Cosmology: The Big Bang and the Fate of the Universe

The Early Universe: Toward the Beginning of Time

Life in the Universe: Are We Alone?

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