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Arlecino [84]
3 years ago
14

When scientists observed the light from stars and galaxies, they noticed that their color shifted toward the end of the visible

color spectrum.
A. violet
B. Green
C. Red
D. Blue
Physics
2 answers:
kakasveta [241]3 years ago
8 0
<h2>Right answer: Red  </h2>

When we talk about the visible electromagnetic spectrum, we know it starts in <u>violet-blue</u> and ends in <u>red</u>.

Now, in this context the astronomer Edwin Powell Hubble observed several celestial bodies, and when obtaining <u>the spectra of distant galaxies</u> he observed that the spectral lines were displaced towards the red one (red shift), whereas <u>the nearby stars</u> showed a spectrum displaced to the blue one.

From there, Hubble deduced that the farther the galaxy is, the more redshifted it is in its spectrum, and noted that all galaxies are "moving away from each other with a speed that increases with distance".  

In other words: In the past the distance between two galaxies was smaller than at present, being this <u>the proof that the universe is expanding </u>(like a balloon expands when it is filled with air).

It should be noted that the redshift is not produced by the relative movement of the galaxies with each other.

<h2>This effect is due to the own expansion of the space among the galaxies. </h2>
lakkis [162]3 years ago
7 0
Color shifted towards the end is C red
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Answer:

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kifflom [539]

Answer: c. 1.3 m/s^2

Explanation:

When he is at rest, is weight can be calculated as:

W = g*m

where:

m = mass of the man

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We know that at rest his weight is W = 824N, then we have:

824N = m*9.8m/s^2

824N/(9.8m/s^2) = m = 84.1 kg

Now, when the elevators moves up with an acceleration a, the acceleration that the man inside fells down is g + a.

Then the new weight is calculated as:

W = m*(g + a)

and we know that in this case:

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Then we can find the value of a if we solve:

932N = 84.1kg*(9.8m/s^2 + a)

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3 0
3 years ago
in a cricket match there are 5000 spectators counted 10 by 10 the number of significant figure in the measurement will be
BabaBlast [244]

Answer:

\boxed{3 \ Significant \ figures}

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See attached file

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3 0
3 years ago
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