Question 1

Why might astronomers some day establish an observatory on the moon? Why would radio astronomers prefer the far side of the moon for their observatory?

Accepted Answer

Astronomers might someday establish an o

Question 2

All radio telescopes are refracting telescopes.

Accepted Answer

A) True 
 B)False

Question 3

Explain how interferometry works.

Accepted Answer

The answer of Explain how interferometry works....

Question 4

What is the frequency of the shortest wavelength light that can be detected by the average human eye?

Accepted Answer

A)  0.0025 Hz 
B)  7.5*1014 Hz 
C)  3.0*108 m/sec 
D)  700 nm 
E)  400 nm 
A)  0.0025 Hz 
B)  7.5*1014 Hz 
C)  3.0*108 m/sec 
D)  700 nm 
E)  400 nm

Question 5

What is the wavelength of light that has a frequency of 3 MHz?

Accepted Answer

A)  9*1014Hz 
B)  1*1014 m 
C)  9*1014m 
D)  100 m 
E)  0.01 m 
A)  9*1014Hz 
B)  1*1014 m 
C)  9*1014m 
D)  100 m 
E)  0.01 m

Question 6

The resolving power of an optical telescope with a diameter of 232 cm is

Accepted Answer

A)  0.05 arc seconds. 
B)  232 arc seconds. 
C)  2.32 arc seconds. 
D)  5 arc seconds. 
E)  11.6 arc seconds. 
A)  0.05 arc seconds. 
B)  232 arc seconds. 
C)  2.32 arc seconds. 
D)  5 arc seconds. 
E)  11.6 arc seconds.

Question 7

Why are nearly all recently built astronomical telescopes reflectors instead of refractors?

Accepted Answer

The answer of Why are nearly all recently built astronomical...

Question 8

A new generation of ground-based telescopes is currently being built that overcomes the limitations of the older large telescopes. Some of these new telescopes

Accepted Answer

A)  use segmented mirrors. 
B)  use mirrors that are very thin. 
C)  use active optics to control the shape of the mirror. 
D)  all of the above. 
E)  none of the above 
A)  use segmented mirrors. 
B)  use mirrors that are very thin. 
C)  use active optics to control the shape of the mirror. 
D)  all of the above. 
E)  none of the above

Question 9

A nanometer is

Accepted Answer

A)  a unit of frequency. 
B)  a unit of energy. 
C)  a unit of mass. 
D)  a unit of length. 
E)  a unit of resolving power. 
A)  a unit of frequency. 
B)  a unit of energy. 
C)  a unit of mass. 
D)  a unit of length. 
E)  a unit of resolving power.

Question 10

The energy of a photon

Accepted Answer

A)  is proportional to the wavelength of the light. 
B)  is inversely proportional to the wavelength of the light. 
C)  depends only on the speed of the light. 
D)  depends only on the mass of the photon. 
E)  depends on both the mass and speed of the photon. 
A)  is proportional to the wavelength of the light. 
B)  is inversely proportional to the wavelength of the light. 
C)  depends only on the speed of the light. 
D)  depends only on the mass of the photon. 
E)  depends on both the mass and speed of the photon.

Question 11

____ is absorbed by water in Earth s atmosphere and requires that telescopes for observing at these wavelengths be placed on mountain tops or in space.

Accepted Answer

A)  Infrared radiation 
B)  Ultraviolet radiation 
C)  Radio wave radiation 
D)  X-ray radiation 
E)  Visible light 
A)  Infrared radiation 
B)  Ultraviolet radiation 
C)  Radio wave radiation 
D)  X-ray radiation 
E)  Visible light

Question 12

An achromatic lens

Accepted Answer

A)  is used to correct spherical aberration in reflecting telescopes. 
B)  is used to correct chromatic aberration in refracting telescopes. 
C)  is used to correct spherical aberration in refracting telescopes. 
D)  is used to correct chromatic aberration in reflecting telescopes. 
E)  contains two mirrors and focuses the light back through the primary mirror. 
A)  is used to correct spherical aberration in reflecting telescopes. 
B)  is used to correct chromatic aberration in refracting telescopes. 
C)  is used to correct spherical aberration in refracting telescopes. 
D)  is used to correct chromatic aberration in reflecting telescopes. 
E)  contains two mirrors and focuses the light back through the primary mirror.

Question 13

How do atmospheric windows limit observations made from Earth s surface?

Accepted Answer

The answer of How do atmospheric windows limit observations made...

Question 14

A telescope whose objective is a lens and contains no mirrors is a(n) ____ telescope.

Accepted Answer

A)  Refracting 
B)  Reflecting 
C)  Deflecting 
D)  Compound 
E)  Retracting 
A)  Refracting 
B)  Reflecting 
C)  Deflecting 
D)  Compound 
E)  Retracting

Question 15

The largest single dish radio telescope is ____ .

Accepted Answer

A)  suspended on cables in a valley 
B)  buried deep in a mine underground 
C)  orbiting in space 
D)  suspended from balloons in the upper atmosphere 
A)  suspended on cables in a valley 
B)  buried deep in a mine underground 
C)  orbiting in space 
D)  suspended from balloons in the upper atmosphere

Question 16

In which way does a photon of blue light NOT differ from a photon of red light?

Accepted Answer

A)  Energy 
B)  Speed 
C)  Wavelength 
D)  Color 
E)  Frequency 
A)  Energy 
B)  Speed 
C)  Wavelength 
D)  Color 
E)  Frequency

Question 17

How do electronic cameras resemble photographic plates? How do they differ?

Accepted Answer

The answer of How do electronic cameras resemble photographic plates?...

Question 18

The light-gathering power of a telescope increases as the size of the objective increases.

Accepted Answer

A) True 
 B)False

Question 19

X-rays easily penetrate Earth s atmosphere and reach the ground from space.

Accepted Answer

A) True 
 B)False

Question 20

In a reflecting telescope the objective is a ____.

Accepted Answer

A)  prism 
B)  mirror 
C)  lens 
D)  diffraction grating 
E)  photographic plate 
A)  prism 
B)  mirror 
C)  lens 
D)  diffraction grating 
E)  photographic plate

Why might astronomers some day establish an observatory on the moon? Why would radio astronomers prefer the far side of the moon for their observatory?

All radio telescopes are refracting telescopes.

Explain how interferometry works.

What is the frequency of the shortest wavelength light that can be detected by the average human eye?

What is the wavelength of light that has a frequency of 3 MHz?

The resolving power of an optical telescope with a diameter of 232 cm is

Why are nearly all recently built astronomical telescopes reflectors instead of refractors?

A new generation of ground-based telescopes is currently being built that overcomes the limitations of the older large telescopes. Some of these new telescopes

A nanometer is

The energy of a photon

____ is absorbed by water in Earth s atmosphere and requires that telescopes for observing at these wavelengths be placed on mountain tops or in space.

An achromatic lens

How do atmospheric windows limit observations made from Earth s surface?

A telescope whose objective is a lens and contains no mirrors is a(n) ____ telescope.

The largest single dish radio telescope is ____ .

In which way does a photon of blue light NOT differ from a photon of red light?

How do electronic cameras resemble photographic plates? How do they differ?

The light-gathering power of a telescope increases as the size of the objective increases.

X-rays easily penetrate Earth s atmosphere and reach the ground from space.

In a reflecting telescope the objective is a ____.

Here and Now

Users Guide to the Sky: Patterns and Cycles

The Origin of Modern Astronomy

Sun Light and Sun Atoms

The Terrestrial Planets

The Outer Solar System

Origins of the Solar System and Extrasolar Planets

The Family of Stars

Structure and Formation of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies: Normal and Active

Modern Cosmology

Life on Other Worlds

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Exam 4: Light and Telescopes

Why might astronomers some day establish an observatory on the moon? Why would radio astronomers prefer the far side of the moon for their observatory?

All radio telescopes are refracting telescopes.

Explain how interferometry works.

What is the frequency of the shortest wavelength light that can be detected by the average human eye?

What is the wavelength of light that has a frequency of 3 MHz?

The resolving power of an optical telescope with a diameter of 232 cm is

Why are nearly all recently built astronomical telescopes reflectors instead of refractors?

A new generation of ground-based telescopes is currently being built that overcomes the limitations of the older large telescopes. Some of these new telescopes

A nanometer is

The energy of a photon

____ is absorbed by water in Earth s atmosphere and requires that telescopes for observing at these wavelengths be placed on mountain tops or in space.

An achromatic lens

How do atmospheric windows limit observations made from Earth s surface?

A telescope whose objective is a lens and contains no mirrors is a(n) ____ telescope.

The largest single dish radio telescope is ____ .

In which way does a photon of blue light NOT differ from a photon of red light?

How do electronic cameras resemble photographic plates? How do they differ?

The light-gathering power of a telescope increases as the size of the objective increases.

X-rays easily penetrate Earth s atmosphere and reach the ground from space.

In a reflecting telescope the objective is a ____.

Here and Now

Users Guide to the Sky: Patterns and Cycles

The Origin of Modern Astronomy

Sun Light and Sun Atoms

The Terrestrial Planets

The Outer Solar System

Origins of the Solar System and Extrasolar Planets

The Family of Stars

Structure and Formation of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies: Normal and Active

Modern Cosmology

Life on Other Worlds

Filters