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Sonja [21]
3 years ago
13

When does a protostar become a true star?

Geography
1 answer:
Lubov Fominskaja [6]3 years ago
5 0

Answer:

C) when nuclear fusion begins in the core

Explanation:

  • <u>The protostar is a main-sequence star that has a core temperature that exceeds abut 10 million K and is needed for the hydrogen to operate efficiently and the </u><u>length </u><u>of this process depends on nature and the stellar </u><u>mass</u><u>, as the huge massive star have a greater and bigger core and fusion takes fast. </u>
  • A protostar is also called as primitive star and represents the earliest phases of the process of the stellar evolution and takes place after it leaves form the main sequence star.
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Telescope A has a diameter of 1.00 meters, while telescope B’s diameter is 9.00 meters. What is the ratio of the angular resolut
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Answer:

the ratio of resolution will be \frac{1}{9}  

Explanation:

We have given the diameter of Telescope A is 1 meter

And diameter of telescope B is 6 meter

We know that resolution of telescope is inversely proportional to diameter of the telescope

So resolution\ \propto\frac{1}{diameter}

We have to find the ratio of resolution of B to A

So \frac{\Delta \Theta _B}{\Delta \Theta _A}=\frac{D_A}{D_B}=\frac{1}{9}

So the ratio of resolution will be \frac{1}{9}  

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3 years ago
What causes the different seasons on Earth? A.The way heat energy reflects off of Earth because of the angle at which it hits B.
adell [148]

Answer:

C. The fact that Earth rotates around its axis

Explanation:

The seasons are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels through its year-long path around the sun. The Earth has a tilt of 23.5 degrees relative to the "ecliptic plane"

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What factors influence the rate of population growth of Eastern Europe? Select all that apply.
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Answer:

- availability of birth control

- migration

- uncertainty about the future

Explanation:

Eastern Europe is a region that has a negative demographic trends. The population is going down, and there isn't a single country of this region that actually has a positive population growth. There are several reasons as to why this is happening. One of the main factors in the migration, as these countries are developing countries and they don't offer high wages and good living conditions, lot of people migrate in Western Europe and North America. Because the economy of these countries is not the best, the people are afraid about their future, so they choose to have one or two children tops, as they are not sure will they be able to afford to have more. The availability of the birth control also had its impact, as the women can be sexually active but not be afraid that they will get pregnant when they don't want to.

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How do monsoons affect economic activities<br> in South Asia?
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Careful measurements reveal that a star maintains a steady apparent brightness at most times, except that at precise intervals o
Anit [1.1K]

Answer:

The star is a member of an eclipsing binary star system

Explanation:

  • A careful explanation about the measurement reveals that the star maintains a steady and apparent shape of brightness and at most of the time remains brighter.
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