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3 years ago

How does the Doppler effect support the big bang theory?

2 answers:

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If the star is receding, the pattern moves to longer, redder wavelengths. This is called redshift. Edwin Hubble used the Doppler effect<span> to determine that the universe is expanding. ... This red shift indicates that stars are moving away from us and from each other.</span>

Brums [2.3K]3 years ago

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Explanation:

Doppler effect is observed in the difference between the frequencies emitted by an object and the frequencies received by an observer due to the relative speed between them. The first to describe such an effect mathematically was Johann Christian Doppler. Studies show us that the Big Bang or "Big Bang" theory explosion ", a term suggested by Fred Hoyle in 1950, means that the Universe started in a small space with all its mass and high concentrated density. After 1923, scientists found that the Universe was more than just the Milky Way, and today it is known that it is just one of over 400 billion galaxies observed.

Since light is also a wave, it behaves in the same way, which is why through this frequency difference one can determine the speed of stars and galaxies relative to the earth. In the case of light, however, because it is highly fast, the difference in frequency is noticeable only if the source is also fast. In this case, when the star/galaxy is moving away from Earth, the light we receive has an apparent frequency less than the actual frequency emitted, with a redshift deviation, which has the lowest visible frequency. When the star/galaxy is approaching Earth, the light we receive has an apparent frequency greater than the actual frequency emitted, with a deviation to blue (blueshift), which has the highest visible frequency.

With the expansion of the universe is the same thing. The universe expands without increasing the size of objects such as stars, planets, galaxies, etc, but increases the distance between them, and the wavelength of light also stretches and gets bigger, causing the redshift seen by an observer. This explanation is different from that of the Doppler Effect since here the objects are not moving relative to each other so the name is changed to cosmological redshift, but the physical treatment is the same as the Doppler effect, so this theory is still valid.

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What change is observed in leukocytes during an allergic disorder (type I hypersensitivity) often caused by asthma, hay fever, a

blagie [28]

Answer:

Increase in eosinophils.

Explanation:

The leukocytes are the white blood cell that plays an important role in the immune system. The white blood cell include eosinophil, basophil, neutrophil and monocytes.

The allergic reactions that are caused by hay fever or asthma is marked by the excess increase in the number of eosinophils in the body. The eosinophils are the first to reach at the site of parasitic infections and protect the body during the allergic reactions.

Thus, the answer is eosinophils.

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4 years ago

The Energetics of Coupled Transport

andrezito [222]

Answer:

Explanation:

A. False - A symporter system requires that one of the molecules to be transported using passive transport.

B. True - The Na+ will move down the established concentration gradient releasing energy to facilitate movement of sucrose against its concentration gradient. This is known as secondary active transport.

C. False - sucrose moves through ion channels not by diffusion to better control its movement across the membrane.

D. True - Movement of molecules against their concentration gradient thus requiring energy input is known as active transport.

E. False - One of the molecules needs to be moving against its concentration gradient.

F. False - A Uniporter system allows the binding and transport of a single molecule at a time. A symporter allows simultaneous binding and transport of Na+ and sucrose molecules.

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3 years ago

There are 258 g of MgCl2/liter. What is the molarity of the solution?

Zolol [24]

Taking into account the definition of molarity, the molarity of the solution is 2.7098 moles of MgCl₂/liter.

<h3>Definition of molarity</h3>

Molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

molarity= number of moles÷ volume

<h3>Molarity of the solution in this case</h3>

In this case, you know that the molar mass of MgCl₂ is 95.21 g/mole [molar mass is the amount of mass that a substance contains in one mole.]

You can apply the following rule of three: If by definition of molar mass 95.21 grams are contained in 1 mole, 258 grams are contained in how many moles?

amount of moles= (258 grams× 1 mole)÷ 95.21 grams

<u><em>amount of moles= 2.7098 moles</em></u>

Replacing in the definition of molarity:

258 g of MgCl₂/liter= <u><em>2.7098 moles of MgCl₂/liter</em></u>

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Finally, the molarity of the solution is 2.7098 moles of MgCl₂/liter.

Learn more about molarity:

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