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algol13
3 years ago
8

How do scientists know that the universe is expanding?

Chemistry
2 answers:
aksik [14]3 years ago
7 0

It is known that the elements captivate and emit specific wavelengths of light, that is, the part of the electromagnetic spectrum. By examining the wavelengths of light discharged by an object in space, one can attain an ample amount of information. The astronomers studied the variation in the position of lines in the spectrum from a star, this can predict the distance of the star, that is, and whether it is moving away or towards us, and how quickly it is moving.  

While studying the radiation discharged by the galaxies or the distant stars, the scientists witnessed the shifting of emission spectra towards the red region of the electromagnetic spectrum, that is, the witnessed wavelengths are longer than anticipated.  

There is something, which is responsible for the wavelength of the radiation to stretch. However, in spite of a real variation in the wavelength, this procedure was something identical to the Doppler Effect.  

DanielleElmas [232]3 years ago
4 0
Galaxies are moving away from us and the farther away a galaxy is the faster it is moving away from us. The galaxies seem to be receding from us because the entire universe is getting larger.
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inysia [295]
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4 0
4 years ago
Which is the first step to take to help reduce pollution
rjkz [21]

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6 0
3 years ago
Which is one way to test whether an unknown solution is acidic or basic
yarga [219]

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7 0
3 years ago
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If you can smell your grandmother’s perfume from across the room, you are experiencing the result of which liquid property?
cestrela7 [59]
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5 0
3 years ago
How many formula units of CaO are in 32.7 g of CaO?
max2010maxim [7]

Answer:

3.51× 10²³ formula units

Explanation:

Given data:

Mass of CaO = 32.7 g

Number of formula units = ?

Solution:

First of all we will calculate the number of moles.

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Number of moles = 32.7 g/ 56.1 g/mol

Number of moles = 0.583 mol

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3.51× 10²³ formula units

The number 6.022 × 10²³ is called Avogadro number.

7 0
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