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ASTR 102 Exam Questions With Correct Answers Current Update Which of the following statements about light focusing is not true? A) In a healthy eye, light is focused on the retina. B) Film should be placed at the focal plane in a camera. C) If you try to look at an image that is not formed...

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  • August 9, 2024
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  • 2024/2025
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ASTR 102 Exam Questions With Correct
Answers Current Update
Which of the following statements about light focusing is not true?

A) In a healthy eye, light is focused on the retina.
B) Film should be placed at the focal plane in a camera.
C) If you try to look at an image that is not formed at the focal plane, it will be blurry.
D) The focal plane of a reflecting telescope is always located within a few inches of the
primary mirror. - Answer -D) The focal plane of a reflecting telescope is always located
within a few inches of the primary mirror.

Suppose the angular separation of two stars is smaller than the angular resolution of
your eyes. How will the stars appear to your eyes?

A) You will not be able to see these two stars at all.
B) The two stars will look like a single point of light.
C) The two stars will appear to be touching, looking rather like a small dumbbell.
D) You will see two distinct stars.
E) You will see only the larger of the two stars, not the smaller one. - Answer -B) The
two stars will look like a single point of light.

Which of the following is a principal advantage of CCDs over photographic film?

A) CCDs allow long exposures (e.g., minutes or hours), and film does not.
B) CCDs can record the colors of astronomical objects accurately, while film cannot.
C) CCDs capture a much higher percentage of the incoming photons than does film.
D) Images recorded with CCDs never require any image processing, while images
recorded by film often do.
E) CCDs can be attached to modern telescopes more easily than cameras. - Answer -
C) CCDs capture a much higher percentage of the incoming photons than does film.

Order the following in order of increasing efficiency of detecting photons of visible light.

A) eye, photographic film, CCD
B) photographic film, CCD, eye
C) CCD, eye, photographic film
D) CCD, photographic film, eye
E) eye, CCD, photographic film - Answer -A) eye, photographic film, CCD

Which of the following statements best describes the two principal advantages of
telescopes over eyes?

A) Telescopes can collect far more light with far better angular resolution.

, B) Telescopes can collect far more light with far greater magnification.
C) Telescopes have much more magnification and better angular resolution.
D) Telescopes collect more light and are unaffected by twinkling.
E) Telescopes can see farther without image distortion and can record more accurate
colors. - Answer -A) Telescopes can collect far more light with far better angular
resolution.

Currently, the largest optical telescope mirrors have a diameter of

A) 1 m.
B) 2 m.
C) 5 m.
D) 10 m.
E) 100 m. - Answer -D) 10 m.

What do we mean by the diffraction limit of a telescope?

A) It is the maximum size to which any telescope can be built.
B) It describes the farthest distance to which the telescope can see.
C) It describes the maximum exposure time for images captured with the telescope.
D) It is the best angular resolution the telescope could achieve with perfect optical
quality and in the absence of atmospheric distortion. - Answer -D) It is the best angular
resolution the telescope could achieve with perfect optical quality and in the absence of
atmospheric distortion.

Which of the following could not be measured by an observation that uses only
imaging?

A) the rate at which a variable star brightens and dims
B) the general shape of an interstellar cloud of gas
C) the color of a planet
D) the brightness of a star in our sky
E) the number of bright stars in a nearby star cluster - Answer -A) the rate at which a
variable star brightens and dims

Which of the following could not be determined by an observation that uses only
spectroscopy?

A) the chemical composition of a distant star
B) the speed at which a distant galaxy is moving away from us
C) the surface temperature of a distant star
D) the rotation rate of a distant star
E) the size of a distant galaxy - Answer -E) the size of a distant galaxy

What is meant by spectral resolution?

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