Question 1Modern telescopes use mirrors rather than lenses for all of these reasons EXCEPT a light passing through lenses can be absorbed or scattered.. Question 1Modern telescopes use
Trang 2Question 1
Modern telescopes use mirrors rather than lenses for all of
these reasons EXCEPT
a) light passing through lenses can be
absorbed or scattered
b) large lenses can be very heavy
c) large lenses are more difficult to make
d) mirrors can be computer controlled to
improve resolution
e) reflecting telescopes aren’t affected
by the atmosphere as much
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Trang 3Question 1
Modern telescopes use mirrors rather than lenses for all of
these reasons EXCEPT
a) light passing through lenses can be
absorbed or scattered
b) large lenses can be very heavy
c) large lenses are more difficult to make
d) mirrors can be computer controlled to
improve resolution
by the atmosphere as much.
Explanation: Reflecting instruments like the KECK telescope can
be made larger, and more effective, than refractors.
Trang 4Question 2
Seeing in astronomy is a measurement of the
a) quality of the telescope’s optics
b) transparency of a telescope’s lens
c) sharpness of vision of your eyes
d) image quality due to air stability
e) sky’s clarity and absence of clouds
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Trang 5Question 2
Seeing in astronomy is a measurement of the
a) quality of the telescope’s optics
b) transparency of a telescope’s lens
c) sharpness of vision of your eyes
e) sky’s clarity and absence of clouds
Explanation: “Good seeing”
occurs when the atmosphere is
clear and the air is still Turbulent
air produces “poor seeing, and
fuzzier images.
Trang 6Question 3
Diffraction is the tendency of light to
a) bend around corners and edges
b) separate into its component colors
c) bend through a lens
d) disperse within a prism
e) reflect off a mirror
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Trang 7Question 3
Diffraction is the tendency of light to
b) separate into its component colors
c) bend through a lens
d) disperse within a prism
e) reflect off a mirror
Explanation: Diffraction affects
all telescopes and limits the
sharpness of all images.
Trang 8Question 4
Resolution is improved by using
a) larger telescopes and longer wavelengths
Trang 9Question 4
Resolution is improved by using
a) larger telescopes and longer wavelengths
Explanation: Diffraction limits
resolution; larger telescopes and
shorter wave light produces
sharper images.
Trang 10Question 5
An advantage of charge-coupled devices (CCDs) over photographic film is that
a) they don’t require chemical development
b) digital data are easily stored and transmitted
c) CCDs are more light sensitive than film
d) CCD images can be developed faster
e) all of the above are true
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Trang 11Question 5
An advantage of charge-coupled devices (CCDs) over photographic film is that
a) they don’t require chemical development
b) digital data are easily stored and transmitted
c) CCDs are more light sensitive than film
d) CCD images can be developed faster
Trang 12Question 6
Radio dishes are large in order to
a) improve angular resolution
b) give greater magnification
c) increase the range of waves they can collect
d) detect shorter waves than optical telescopes for superior resolution
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Trang 13Question 6
Radio dishes are large in order to
b) give greater magnification
c) increase the range of waves they can collect
d) detect shorter waves than optical telescopes for superior resolution
Trang 14Question 7
Adaptive optics refers to
a) making telescopes larger or smaller
b) reducing atmospheric blurring using computer control
c) collecting different kinds of light with one type of telescope
d) using multiple linked telescopes
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Trang 15Question 7
Adaptive optics refers to
a) making telescopes larger or smaller
Trang 16Question 8
Radio telescopes are useful because
a) observations can be made day and night
b) we can see objects that don’t emit visible light
c) radio waves are not blocked by interstellar dust
d) they can be linked to form interferometers
e) all of the above are true
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Trang 17Question 8
Radio telescopes are useful because
a) observations can be made day and night
b) we can see objects that don’t emit visible light
c) radio waves are not blocked by interstellar dust
d) they can be linked to form interferometers
Explanation: The Very Large
Array links separate radio
telescopes to create much
better resolution.
Trang 18Question 9
Infrared telescopes are very useful for observing
a) pulsars and black holes
b) from locations on the ground
c) hot stars and intergalactic gas
d) neutron stars
e) cool stars and star-forming regions
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Trang 19Question 9
Infrared telescopes are very useful for observing
a) pulsars and black holes
b) from locations on the ground
c) hot stars and intergalactic gas
Trang 20Question 10
The Hubble Space Telescope (HST) offers sharper images
than ground telescopes primarily because
a) HST is closer to planets
and stars
b) HST uses a larger primary
mirror
c) it gathers X-ray light
d) HST orbits above the atmosphere.
e) it stays on the nighttime side of Earth
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Trang 21Question 10
The Hubble Space Telescope (HST) offers sharper images
than ground telescopes primarily because
a) HST is closer to planets
and stars
b) HST uses a larger primary
mirror
c) it gathers X-ray light
e) it stays on the nighttime side of Earth
Explanation: HST orbits less than 400 miles above Earth—not
much closer to stars and planets! But it can gather UV, visible,
and infrared light, unaffected by Earth’s atmosphere.