What are two advantages of large scopes over smaller ones?
answer
Large telescope have more light grasp and better resolution.
question
This design involves only one optical surface, a concave mirror.
answer
prime focus reflector
question
Which of these devices helps correct coma in fast reflectors?
answer
Schmidt corrector plate
question
The primary purpose of a telescope is to
answer
collect a large amount of light and bring it into focus.
question
A telescope with a 60 mm objective lens collects how many times as much light as does your eye's 6 mm exit pupil?
answer
100x
question
Why are most large telescopes reflectors, not refractors?
answer
All of the above are correct
question
Diffraction is the tendency of light to:
answer
spread around corners
question
A major advantage of a Newtonian reflector over a refractor is
answer
the elimination of chromatic aberration
question
What problem is adaptive optics designed to correct?
answer
the effects of atmospheric turbulence
question
Green light has a shorter wavelength than orange light. In a 5 inch telescope, green light will
answer
provide better angular resolution than orange light.
question
In astronomy, an interferometer can be used to
answer
improve the angular resolution of radio telescopes
question
Which of the following greatly improves the angular resolution of radio maps?
answer
use of interferometers
question
The most important advantage of CCDs over film is that
answer
they record much more light in a given exposure time.
question
What is the resolving power of the telescope?
answer
the ability to distinguish adjacent objects in the sky
question
The amount of diffraction and thus the resolution of the scope depends upon
answer
the wavelength used and the size of the main telescope objective lens or mirror.
question
Describe at least three advantages of CCD imaging over visual or photographic work.
answer
The CCD is far more efficient in capturing light than the fastest film, so fainter objects can be imaged with much shorter exposures or with smaller, cheaper telescopes. The image is digital, and can be monitored as it is building up for quality assurance; you don't have to wait to develop the film to know that you have good data. This digital image is easily stored on computers, and quickly shared with others via the Internet and many other media.
question
Which of the following is a problem inherent in all large radio telescopes?
answer
Radio waves have long wavelengths, so radio telescopes have poor resolution.
question
Which method of astronomical measurement is the precise measurement of brightness?
answer
photometry
question
One advantage of the Hubble Space telescope over ground based ones is that
answer
in orbit, it can operate close to its diffraction limit at visible wavelengths.
question
It is diffraction that limits the ________ of a telescope of a given objective diameter.
answer
resolution
question
In which part of the electromagnetic spectrum have astronomers been unable to get any information?
answer
We now can access information in all spectral lengths
question
It is diffraction that limits the ________ of a telescope's objective.
answer
resolution
question
The amount of diffraction a telescope creates depends upon:
answer
the wavelength and the diameter of the telescope objective.
question
The angular resolution of an 8 inch diameter telescope is ________ greater than that of a 2-inch diameter telescope.
answer
4x
question
What problem does adaptive optics correct?
answer
turbulence in the earth's atmosphere which creates twinkling
question
Which type of telescope has the simplest light path?
answer
prime focus reflector
question
How much better resolution would a 60 mm objective lens have than your eye's 6 mm exit pupil?
answer
10x
question
What is "seeing"?
answer
a measurement of the image quality due to air stability
question
How do radio interferometers greatly enhance resolution in radio wavelengths?
answer
Hooking two or more radio dishes together with a computer lets us get resolution not equal to the diameters of the dishes, but to the separations between the scopes.
question
The name of the new Infrared Orbiting Observatory is the:
answer
Spitzer Space telescope
question
The angular resolution of an 8 inch diameter telescope is ________ greater than that of a 2-inch diameter telescope.
answer
4x
question
What problem do refractor telescopes have that reflectors don't?
answer
chromatic aberration
question
Compared to a 5 inch prime focus reflector, a 5-inch Newtonian reflector will
answer
have the same light gathering power.
question
What type of telescope is the Subaru telescope (shown below)?
answer
Cassegrain reflector
question
What is the primary purpose of an astronomical telescope?
answer
collecting light and bring it to focus
question
The process occurring when photons bounce off a polished
surface is called:
answer
reflection
question
Which design is subject to chromatic aberration
answer
prime focus reflector
question
The tendency of a wave to bend as it passes from one
transparent medium to another is called:
answer
refraction
question
The primary purpose of a telescope is to
answer
A) collect a large amount of light and bring it into focus.
B) magnify distant objects.
question
This design involves only one optical surface, a concave mirror.
answer
prime focus reflector
question
Why are most large telescopes reflectors, not refractors
answer
Large lenses deform under their own weight, but mirrors
can be supported.
B) Large mirrors need only one optical surface, achromats four
surfaces to grind.
C) Reflectors do not suffer from chromatic aberration like
refractors do.
D) Large, very clear lenses are harder to cast than more tolerant
mirror blanks
question
Which design has a convex primary mirror and flat secondary
mirror, with the eyepiece located on the top side of the telescope
tube?
answer
Newtonian reflector
question
The convex secondary mirror in this design focuses light down
through a hole cut in the concave primary mirror
answer
Cassegrain reflector
question
The amount of diffraction and thus the resolution of the
scope depends upon
answer
the wavelength used and the size of the main telescope
objective lens or mirror.
question
The angular resolution of an 8 inch diameter telescope
is _______ greater than that of a 2 inch diameter telescope
answer
4−times
question
It is diffraction that limits the ________ of a telescope's:
answer
angular resolution
question
What is the (angular) resolution of a telescope?
answer
its ability to see very faint objects
question
What is the resolving power of the telescope
answer
the ability to distinguish adjacent objects in the sky
question
What is the light−gathering power of an 8 inch telescope compared
to a 4 inch telescope
answer
4−times better
question
Compared to a 5 inch prime focus reflector, a 5 inch Newtonian
reflector will
answer
have the same light gathering power.
question
Which method of astronomical measurement is the precise
measurement of brightness
answer
photometry
question
A telescope with a 60 mm objective lens collects how many times
more light than does your eye's 6 mm pupil
answer
100X
question
Diffraction is the tendency of light to:
answer
spread around corners.
question
It is diffraction that limits the ________ of a telescope
of a given objective diameter.
answer
angular resolution
question
What are two advantages of large telescopes over smaller ones?
answer
Large telescope have more light grasp and better angular resolution
question
The amount of diffraction a telescope creates depends upon
answer
the wavelength and the diameter of the telescope objective
question
What type of telescope is the Hubble Space Telescope
answer
refractor OR cassegrain
question
Refractor telescopes suffer from this separation of light
into its component colors
answer
chromatic aberration
question
One advantage of the Hubble Space telescope over ground
based telescopes is that
answer
its adaptive optics controls atmospheric blurring better.
question
Green light has a shorter wavelength than orange light.
In a 5 inch telescope, green light will
answer
provide better angular resolution than orange ligh
question
What is "seeing"?
answer
a measurement of the image quality due to air quality
question
A mountain top is an especially good site for infrared telescopes since:
answer
you are above most of the carbon dioxide and water vapor in the atmosphere
question
What problem does adaptive optics correct?
answer
turbulence in the earthʹs atmosphere which creates twinkling
question
What problem is adaptive optics designed to correct
answer
the effects of atmospheric turbulence
question
The Arecibo radio telescope is laid out like which optical
telescope design?
answer
prime focus reflector
question
What is true of radio telescopes?
answer
They have poorer angular resolution than an optical refractor.
question
Which of the following is a problem inherent in all large radio telescopes
answer
Radio waves have long wavelengths, so radio telescopes have poor
angular resolution.
question
Radio dishes are large in order to:
answer
increase their angular resolution and collect the very weak radio photons
question
36) In astronomy, an interferometer can be used to
answer
improve the angular resolution of radio telescope
question
This design combines the radiation from two different telescopes
to greatly enhance angular resolution via computer synthesis
answer
interferometer
question
Which of the following greatly improves the angular resolution
of radio maps
answer
use of interferometers
question
In which part of the electromagnetic spectrum have astronomers
been unable to get any information?
answer
We now can access information in all spectral lengths
question
Which of the following is currently supplying high resolution
x−ray images from space?
answer
Chandra
question
The design of modern x−ray telescopes depends on
answer
grazing incidence optics
question
The name of the new Infrared Orbiting Observatory is the
answer
Spitzer Space Telescope.
question
The Chandra X−ray telescope must use:
answer
grazing incidence optics to focus the short wavelengths
Haven't found what you need?
Search for quizzes and test answers now
Quizzes.studymoose.com uses cookies. By continuing you agree to our cookie policy
