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A photograph of the night sky was taken with the camera shutter open f

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Which of the following most logically completes the argument?

A photograph of the night sky was taken with the camera shutter open for an extended period. The normal motion of stars across the sky caused the images of the stars in the photograph to appear as streaks. However, one bright spot was not streaked. Even if the spot were caused, as astronomers believe, by a celestial object, that object could still have been moving across the sky during the time the shutter was open, since __________.

A. the spot was not the brightest object in the photograph

B. the photograph contains many streaks that astronomers can identify as caused by noncelestial objects

C. stars in the night sky do not appear to shift position relative to each other

D. the spot could have been caused by an object that emitted a flash that lasted for only a fraction of the time that the camera shutter was open

E. if the camera shutter had not been open for an extended period, it would have recorded substantially fewer celestial objects
[Reveal] Spoiler: OA

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Re: A photograph of the night sky was taken with the camera shutter open f [#permalink]

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New post 25 Jul 2017, 09:31
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carcass wrote:
Which of the following most logically completes the argument?

A photograph of the night sky was taken with the camera shutter open for an extended period. The normal motion of stars across the sky caused the images of the stars in the photograph to appear as streaks. However, one bright spot was not streaked. Even if the spot were caused, as astronomers believe, by a celestial object, that object could still have been moving across the sky during the time the shutter was open, since __________.

A. the spot was not the brightest object in the photograph

B. the photograph contains many streaks that astronomers can identify as caused by noncelestial objects

C. stars in the night sky do not appear to shift position relative to each other

D. the spot could have been caused by an object that emitted a flash that lasted for only a fraction of the time that the camera shutter was open

E. if the camera shutter had not been open for an extended period, it would have recorded substantially fewer celestial objects


Straight D - the spot could have been caused by an object that emitted a flash that lasted for only a fraction of the time that the camera shutter was open
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Re: A photograph of the night sky was taken with the camera shutter open f [#permalink]

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New post 27 Jul 2017, 12:41
can someone explain why D is the answer? I chose B. Can someone explain why B is wrong?

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Re: A photograph of the night sky was taken with the camera shutter open f [#permalink]

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New post 27 Jul 2017, 22:26
B contradicts the previous sentence . It talks about non celestial object.
whereas Astronomers believe that it is celestial object and we have to provide reason why spot was captured instead of streak .

D completes the sentence perfectly
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Re: A photograph of the night sky was taken with the camera shutter open f [#permalink]

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New post 11 Aug 2017, 06:39
WHy C is wrong someone explain that

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Re: A photograph of the night sky was taken with the camera shutter open f [#permalink]

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New post 11 Aug 2017, 07:04
If the shutter speed is slow, it can create an effect called “motion blur”, where moving objects appear blurred along the direction of the motion or appear as streaks as stars in this question. The celestial object not necessarily a star may have emitted a flash only for a fraction of the time when the shutter of the camera was open to capture light. Thus D logically completes the argument.

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A photograph of the night sky was taken with the camera shutter open f [#permalink]

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New post 12 Aug 2017, 08:30
A photograph of the night sky was taken with the camera shutter open for an extended period. The normal motion of stars across the sky caused the images of the stars in the photograph to appear as streaks. However, one bright spot was not streaked. Even if the spot were caused, as astronomers believe, by a celestial object, that object could still have been moving across the sky during the time the shutter was open, since __________.

Type - Explain

A. the spot was not the brightest object in the photograph - Incorrect - it does not explain the situation

B. the photograph contains many streaks that astronomers can identify as caused by noncelestial objects - Incorrect - it does not explain the situation

C. stars in the night sky do not appear to shift position relative to each other - Irrelevant

D. the spot could have been caused by an object that emitted a flash that lasted for only a fraction of the time that the camera shutter was open - Correct - although it was a celestial object , it did not cause a streak as it emitted light for a short duration

E. if the camera shutter had not been open for an extended period, it would have recorded substantially fewer celestial objects - Incorrect - it does not explain the situation

Answer D
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Re: A photograph of the night sky was taken with the camera shutter open f [#permalink]

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New post 20 Sep 2017, 20:51
Which of the following most logically completes the argument?

A photograph of the night sky was taken with the camera shutter open for an extended period. The normal motion of stars across the sky caused the images of the stars in the photograph to appear as streaks. However, one bright spot was not streaked. Even if the spot were caused, as astronomers believe, by a celestial object, that object could still have been moving across the sky during the time the shutter was open, since __________.

A. the spot was not the brightest object in the photograph - Wrong: Out of scope

B. the photograph contains many streaks that astronomers can identify as caused by noncelestial objects -Wrong: Out of scope

C. stars in the night sky do not appear to shift position relative to each other - Wrong: Shell game ("relative to each other")

D. the spot could have been caused by an object that emitted a flash that lasted for only a fraction of the time that the camera shutter was open - Correct: when cause (flash) occurs, effect (spot) occurs

E. if the camera shutter had not been open for an extended period, it would have recorded substantially fewer celestial objects - Wrong: Out of scope

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Re: A photograph of the night sky was taken with the camera shutter open f [#permalink]

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haardiksharma wrote:
WHy C is wrong someone explain that


Think of how two cars moving on the highway going in the same direction appear not to shift position relative to each other, but in reality they are both in motion.

Similarly C is the trap answer for the pre-thinking that the celestial object which marks the bright spot might might be a star that does not shift position relative to the Earth. But instead of mentioning the Earth, C mentions stars relative to each other. Hence, it's incorrect as that's not what's happening in our scenario where the camera is on the Earth.

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A photograph of the night sky was taken with the camera shutter open f [#permalink]

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New post 01 Oct 2017, 05:18
gumnamibaba wrote:
haardiksharma wrote:
WHy C is wrong someone explain that


Think of how two cars moving on the highway going in the same direction appear not to shift position relative to each other, but in reality they are both in motion.

Similarly C is the trap answer for the pre-thinking that the celestial object which marks the bright spot might might be a star that does not shift position relative to the Earth. But instead of mentioning the Earth, C mentions stars relative to each other. Hence, it's incorrect as that's not what's happening in our scenario where the camera is on the Earth.


haardiksharma

I fell to the similar trap and chose answer choice C.

Adding to the above explanation, just ask yourself one question. In case, the star does not change its position relative to the other stars, then ,while other stars have appeared as streaks, why not the this star has appeared as streak?

But the argument says otherwise.

Hope I cleared your doubt.
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Re: A photograph of the night sky was taken with the camera shutter open f [#permalink]

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New post 01 Oct 2017, 06:00
The answer is D .
We are talking about the photograph taken by camera that opened for an extended period of time and the stars appear as streaks .
One spot was not streaked we have to solve this anomaly .
A does nothing to advance our case it just tries to get us lost in different direction.
B Again no difference .
C why will they shift their position they are all moving relative to each other.
D This is our answer it talks about the time during it was a streak .Now just think about it if the streak was over within a very short period as compared to the extended time it will be a spot .
E provides us no information how to resolve the anomaly.


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Re: A photograph of the night sky was taken with the camera shutter open f   [#permalink] 01 Oct 2017, 06:00
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