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

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

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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

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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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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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Re: 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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New post 28 Sep 2017, 12:18
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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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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, 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]

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New post 20 Dec 2017, 21:49
C is a trap b/c C does not directly connect with the argument. In other words, there is a gap between the positions of stars and the flashes, or the spots in the photo. Furthermore, C does not help to explain why astronomers conclude that the object is still moving even though the camera does not spot any light.
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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 06 Jan 2018, 05:05
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 __________.

Aren't we looking for an option which gives us an explanation that this celestial object was moving even though it created only a spot or flash of light?
Given the general pattern of the movement of the objects creating a streak of light.

How is D explaining this phenomena? It does not gives a plausibility of the movement of the object.


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

@experts plz help. I am struggling to understand this.
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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 06 Jan 2018, 22:57
Leo8 wrote:
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 __________.

Aren't we looking for an option which gives us an explanation that this celestial object was moving even though it created only a spot or flash of light?
Given the general pattern of the movement of the objects creating a streak of light.

How is D explaining this phenomena? It does not gives a plausibility of the movement of the object.


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

@experts plz help. I am struggling to understand this.


It is b/c D explains why "one bright spot was not streaked". In other word, D states that the flash is still there, so the conclusion is still true.
Also, D is the only option that connects directly with the argument. Hope it helps.
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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 08 Jan 2018, 13:55
Hi there!
a very beautiful photo, processed using FixThePhoto?
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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 09 Jan 2018, 16:17
I am also struggling to understand this.

D is the perfect alternative explanation for the fact that the point wasn´t streak BUT I don´t understand why it´s the correct answer when the argument kind of asks for an explanation of why the celestial object could still have been moving across the sky. It says "that object could still have been moving across the sky during the time the shutter was open, since __________. " Doesn´t that "since" refers to "why it could still have been moving across the sky"?

What am I geting wrong in here? I find no way to interpret the last part of the argument in the way that it encourages me to find an alternative explanation for how the spot could have been created rather than find a corroboration that if the object had been a celestial object it would have still been moving and so the spot couldn´t have been created by a celestial object.


I am going to need some little support in here. I´m having horrible headaches with this question.


Thanks for any replies :-)



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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 23 Feb 2018, 08:36
RooIgle wrote:
I am also struggling to understand this.

D is the perfect alternative explanation for the fact that the point wasn´t streak BUT I don´t understand why it´s the correct answer when the argument kind of asks for an explanation of why the celestial object could still have been moving across the sky. It says "that object could still have been moving across the sky during the time the shutter was open, since __________. " Doesn´t that "since" refers to "why it could still have been moving across the sky"?

What am I geting wrong in here? I find no way to interpret the last part of the argument in the way that it encourages me to find an alternative explanation for how the spot could have been created rather than find a corroboration that if the object had been a celestial object it would have still been moving and so the spot couldn´t have been created by a celestial object.


I am going to need some little support in here. I´m having horrible headaches with this question.

-


The above info says that: motion of stars ... caused the images of them in photo to appear as streaks. The bright spot was not streaked, but it could still have been moving...during the time the shutter was open. So we're looking for an explanation for that whole thing, not just the part: "why it could still have been moving...".
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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 Jun 2018, 00:17
haardiksharma wrote:
WHy C is wrong someone explain that


Two people are walking together at the same speed and the cameraman tries to make a short video of these two. To the cameraman, would they appear to be at rest or in motion?
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Re: A photograph of the night sky was taken with the camera shutter open f &nbs [#permalink] 11 Jun 2018, 00:17
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