Question 1

What is the light-gathering power of a telescope directly proportional to?

Accepted Answer

A)  the diameter of the primary mirror or lens 
B)  the focal length of the primary mirror or lens 
C)  the length of the telescope tube 
D)  the diameter of the eyepiece 
A)  the diameter of the primary mirror or lens 
B)  the focal length of the primary mirror or lens 
C)  the length of the telescope tube 
D)  the diameter of the eyepiece

Question 2

Why do radio telescopes have poor resolving power?

Accepted Answer

A)  Their diameters are extremely large. 
B)  The energy they receive is not electromagnetic radiation. 
C)  Radio waves have long wavelengths. 
D)  Radio waves travel at slow speeds. 
A)  Their diameters are extremely large. 
B)  The energy they receive is not electromagnetic radiation. 
C)  Radio waves have long wavelengths. 
D)  Radio waves travel at slow speeds.

Question 3

What is the purpose of adaptive optics?

Accepted Answer

A)  to improve diffraction limit and increase magnification power for ground-based telescopes 
B)  to increase the light-gathering power of ground-based telescopes 
C)  to compensate for the distorting effect of atmospheric turbulence in ground-based telescopes 
D)  to see through clouds and remove blurring for ground-based telescopes 
A)  to improve diffraction limit and increase magnification power for ground-based telescopes 
B)  to increase the light-gathering power of ground-based telescopes 
C)  to compensate for the distorting effect of atmospheric turbulence in ground-based telescopes 
D)  to see through clouds and remove blurring for ground-based telescopes

Question 4

Which form of electromagnetic radiation travels fastest?

Accepted Answer

A)  gamma rays 
B)  radio waves 
C)  all electromagnetic radiation travels at the same speed 
D)  the speed of radiation depends on the brightness of the source 
A)  gamma rays 
B)  radio waves 
C)  all electromagnetic radiation travels at the same speed 
D)  the speed of radiation depends on the brightness of the source

Question 5

The sidereal tracker on a telescope mounting must turn the telescope eastward about the polar axis.

Accepted Answer

A) True 
 B)False

Question 6

The ____________________ ____________ of a telescope is determined by the size of the objective.

Accepted Answer

light-gath

Question 7

An array of telescopes work together as an interferometer. How would the interferometer's performance change if many more telescopes were added between the existing telescopes?

Accepted Answer

A)  The resolving power and the light-collecting power would increase. 
B)  The resolving power would increase and the light-collecting power would stay the same. 
C)  The resolving power would stay the same and the light-collecting power would increase. 
D)  The resolving power would decrease and the light-collecting power would stay the same. 
A)  The resolving power and the light-collecting power would increase. 
B)  The resolving power would increase and the light-collecting power would stay the same. 
C)  The resolving power would stay the same and the light-collecting power would increase. 
D)  The resolving power would decrease and the light-collecting power would stay the same.

Question 8

How do photons of blue light differ from photons of red light?

Accepted Answer

A)  Blue light photons have more energy than photons of red light. 
B)  Blue light photons have a lower frequency than photons of red light. 
C)  Blue light photons have a longer wavelength than photons of red light. 
D)  Blue light photons travel faster than photons of red light. 
A)  Blue light photons have more energy than photons of red light. 
B)  Blue light photons have a lower frequency than photons of red light. 
C)  Blue light photons have a longer wavelength than photons of red light. 
D)  Blue light photons travel faster than photons of red light.

Question 9

Telescopes observing in the far ultraviolet can be operated aboard high-flying aircraft.

Accepted Answer

A) True 
 B)False

Question 10

What is the longest wavelength of light that can be seen with the human eye?

Accepted Answer

A)  400 nanometres 
B)  700 nanometres 
C)  7000 nanometres 
D)  3×108 m 
A)  400 nanometres 
B)  700 nanometres 
C)  7000 nanometres 
D)  3×108 m

Question 11

In a reflecting telescope, the primary is a mirror.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following could you use to observe high-energy eruptions caused by black holes?

Accepted Answer

A)  a gamma-ray telescope on a mountaintop 
B)  an infrared telescope at sea level on Earth 
C)  a radio telescope in space 
D)  an X-ray telescope in space 
A)  a gamma-ray telescope on a mountaintop 
B)  an infrared telescope at sea level on Earth 
C)  a radio telescope in space 
D)  an X-ray telescope in space

Question 13

Why must far-infrared astronomy be done from high-flying aircraft or spacecraft?

Accepted Answer

A)  Far-infrared radiation is absorbed low in the Earth's atmosphere. 
B)  Far-infrared photons are quite energetic. 
C)  Far-infrared photons have long wavelengths. 
D)  Far-infrared radiation is reflected from the top of the Earth's atmosphere. 
A)  Far-infrared radiation is absorbed low in the Earth's atmosphere. 
B)  Far-infrared photons are quite energetic. 
C)  Far-infrared photons have long wavelengths. 
D)  Far-infrared radiation is reflected from the top of the Earth's atmosphere.

Question 14

How is the primary of most radio telescopes similar to the primary of a reflecting optical telescope?

Accepted Answer

A)  They both focus electromagnetic radiation. 
B)  They both use glass to bend the path of light rays. 
C)  They are typically the same size. 
D)  They are both made of metal. 
A)  They both focus electromagnetic radiation. 
B)  They both use glass to bend the path of light rays. 
C)  They are typically the same size. 
D)  They are both made of metal.

Question 15

The main lens or mirror of a telescope is called the ____________________.

Accepted Answer

The answer of The main lens or mirror of a...

Question 16

What is the term for a piece of glass with many small parallel lines etched on its surface, used to produce a spectrum?

Accepted Answer

A)  spectrograph 
B)  grating 
C)  charge-coupled device 
D)  prism 
A)  spectrograph 
B)  grating 
C)  charge-coupled device 
D)  prism

Question 17

Why do astronomers build telescopes on tops of mountains?

Accepted Answer

A)  There is less air to dim the light. 
B)  The weather is better on mountaintops. 
C)  Electronic cameras work better when there is less oxygen in the air. 
D)  Mountaintops are closer to objects in space. 
A)  There is less air to dim the light. 
B)  The weather is better on mountaintops. 
C)  Electronic cameras work better when there is less oxygen in the air. 
D)  Mountaintops are closer to objects in space.

Question 18

In which way is a photon of blue light identical to a photon of red light?

Accepted Answer

A)  energy 
B)  speed 
C)  wavelength 
D)  frequency 
A)  energy 
B)  speed 
C)  wavelength 
D)  frequency

Question 19

Which of the following sequences of electromagnetic radiation shows the order of increasing energy correctly?

Accepted Answer

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

Question 20

By what factor is the light-collecting power of the James Webb Space Telescope (6.6 m primary mirror) greater than the light-collecting power of the Hubble Space Telescope (2.4 m primary mirror)?

Accepted Answer

A)  2.75 
B)  7.56 
C)  15.84 
D)  It depends on which wavelength they observe. 
A)  2.75 
B)  7.56 
C)  15.84 
D)  It depends on which wavelength they observe.

What is the light-gathering power of a telescope directly proportional to?

Why do radio telescopes have poor resolving power?

What is the purpose of adaptive optics?

Which form of electromagnetic radiation travels fastest?

The sidereal tracker on a telescope mounting must turn the telescope eastward about the polar axis.

The ________ of a telescope is determined by the size of the objective.

An array of telescopes work together as an interferometer. How would the interferometer's performance change if many more telescopes were added between the existing telescopes?

How do photons of blue light differ from photons of red light?

Telescopes observing in the far ultraviolet can be operated aboard high-flying aircraft.

What is the longest wavelength of light that can be seen with the human eye?

In a reflecting telescope, the primary is a mirror.

Which of the following could you use to observe high-energy eruptions caused by black holes?

Why must far-infrared astronomy be done from high-flying aircraft or spacecraft?

How is the primary of most radio telescopes similar to the primary of a reflecting optical telescope?

The main lens or mirror of a telescope is called the ____________________.

What is the term for a piece of glass with many small parallel lines etched on its surface, used to produce a spectrum?

Why do astronomers build telescopes on tops of mountains?

In which way is a photon of blue light identical to a photon of red light?

Which of the following sequences of electromagnetic radiation shows the order of increasing energy correctly?

By what factor is the light-collecting power of the James Webb Space Telescope (6.6 m primary mirror) greater than the light-collecting power of the Hubble Space Telescope (2.4 m primary mirror)?

The Scale of the Cosmos: Space and Time

Users Guide to the Sky: Patterns and Cycles

The Origin of Modern Astronomy

The Sun: the Closest Star

The Family of Stars

The Structure and Formation of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies

Cosmology in the 21st Century

Planet Formation and Exoplanets

Comparative Planetology of the Terrestrial Planets

The Outer Solar System

Life on Other Worlds

Filters

Exam 4: Astronomical Telescopes and Instruments: Extending Humanitys Vision

What is the light-gathering power of a telescope directly proportional to?

Why do radio telescopes have poor resolving power?

What is the purpose of adaptive optics?

Which form of electromagnetic radiation travels fastest?

The sidereal tracker on a telescope mounting must turn the telescope eastward about the polar axis.

The ____________________ ____________ of a telescope is determined by the size of the objective.

An array of telescopes work together as an interferometer. How would the interferometer's performance change if many more telescopes were added between the existing telescopes?

How do photons of blue light differ from photons of red light?

Telescopes observing in the far ultraviolet can be operated aboard high-flying aircraft.

What is the longest wavelength of light that can be seen with the human eye?

In a reflecting telescope, the primary is a mirror.

Which of the following could you use to observe high-energy eruptions caused by black holes?

Why must far-infrared astronomy be done from high-flying aircraft or spacecraft?

How is the primary of most radio telescopes similar to the primary of a reflecting optical telescope?

The main lens or mirror of a telescope is called the ____________________.

What is the term for a piece of glass with many small parallel lines etched on its surface, used to produce a spectrum?

Why do astronomers build telescopes on tops of mountains?

In which way is a photon of blue light identical to a photon of red light?

Which of the following sequences of electromagnetic radiation shows the order of increasing energy correctly?

By what factor is the light-collecting power of the James Webb Space Telescope (6.6 m primary mirror) greater than the light-collecting power of the Hubble Space Telescope (2.4 m primary mirror)?

The Scale of the Cosmos: Space and Time

Users Guide to the Sky: Patterns and Cycles

The Origin of Modern Astronomy

The Sun: the Closest Star

The Family of Stars

The Structure and Formation of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies

Cosmology in the 21st Century

Planet Formation and Exoplanets

Comparative Planetology of the Terrestrial Planets

The Outer Solar System

Life on Other Worlds

Filters

The ________ of a telescope is determined by the size of the objective.