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Sidana [21]
2 years ago
13

The Doppler. Effect indicates that the universe is expanding because

Chemistry
2 answers:
Juliette [100K]2 years ago
8 0

The correct answer is option C, that is, light from other galaxies is red. Shifted.

It has been witnessed by the astronomers that the light from the distant object in the cosmo is shifted towards the red color frequency that suggests that those objects are moving away or receding from the planet Earth. This process is called Redshift. A similar thing is witnessed for galaxies that are present at very distant places from the planet Earth.  

GalinKa [24]2 years ago
7 0

Answer : The correct answer is option C.

Explanation:

Astronomers have observed that light from the distant object in the universe is shifted towards the frequency of red color which indicates that those object are receding or moving away from the planet earth.This phenomena was termed as Red shift .Same thing goes for galaxies which are very far away from the planet earth.

Where as if galaxies were moving towards the the planet earth their light would have shifted toward the frequency of blue color termed as blue shift.

Hence, the correct answer is option C.

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The measure of how closely a set of measurements are to each other is the best definition for which of the following terms. a er
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D. precision. At first glance you can mark out A and B because the answers does not relate to the question. If question had said "what do you call it when the measurement is close to the actual answer" then you would have picked C. So that leaves you D. precision.
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3 years ago
1. Compare the masses and the charges for the three particles which make<br> up<br> the atom.
storchak [24]

Answer:

The charge on a neutron=1+-/neutral

It has a mass 1

The charge on electron is 1-/negative

It's mass is 1/1840

The charge on a proton is 1+

It has a mass 1 too.

Explanation:

8 0
2 years ago
What is the therm energy of an object?
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Answer:

B

Explanation:

B. the total kinetic and potential energies of its particles

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2 years ago
According to the kinetic molecular theory, the particles of an ideal gas
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A have no potential energy
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3 years ago
If you place 1.0 L of ethanol (C2H5OH) in a small laboratory that is 3.0 m long, 2.0 m wide, and 2.0 m high, will all the alcoho
ankoles [38]

If you place 1.0 L of ethanol (C2H5OH) in a small laboratory that is 3.0 m long, 2.0 m wide, and 2.0 m high, will all the alcohol evaporate? If some liquid remains, how much will there be? The vapor pressure of ethyl alcohol at 25 °C is 59 mm Hg, and the density of the liquid at this temperature is 0.785g/cm^3 .

will all the alcohol evaporate? or none at all?

Answer:

Yes, all the ethanol present in the laboratory will evaporate since the mole of ethanol present in vapor is greater. The volume of ethanol left will therefore  be zero.

Explanation:

Given that:

The volume of alcohol which is placed in a small laboratory = 1.0 L

Vapor pressure of ethyl alcohol  at 25 ° C = 59 mmHg

Converting 59 mmHg to atm ; since 1 atm = 760 mmHg;

Then, we have:

= \frac{59}{760}atm

= 0.078 atm

Temperature = 25 ° C

= ( 25 + 273 K)

= 298 K.

Density of the ethanol = 0.785 g/cm³

The volume of laboratory = l × b × h

= 3.0 m × 2.0 m × 2.5 m

= 15 m³

Converting the volume of laboratory to liter;

since 1 m³ = 100 L; Then, we  have:

15 × 1000 = 15,000 L

Using ideal gas equation to determine the moles of ethanol in vapor phase; we have:

PV = nRT

Making n the subject of the formula; we have:

n = \frac{PV}{RT}

n = \frac{0.078 * 15000}{0.082*290}

n = 47. 88 mol of ethanol

Moles of ethanol in 1.0 L bottle can be calculated as follows:

Since  numbers of moles = \frac{mass}{molar mass}

and mass = density × vollume

Then; we can say ;

number of moles = \frac{density*volume }{molar mass of ethanol}

number of moles =\frac{0.785g/cm^3*1000cm^3}{46.07g/mol}

number of moles = \frac{&85}{46.07}

number of moles = 17.039 mol

Thus , all the ethanol present in the laboratory will evaporate since the mole of ethanol present in vapor is greater. The volume of ethanol left will therefore be zero.

5 0
2 years ago
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