Question

(f) How long does it take for light to reach the earth from Alpha Centauri ?

(g) What will happen to the Sun if there were no gas pressure in the Sun ?

(h) Why does energy of a star decrease ?

(i) How are mass of a star and number of fuels used in its energy generation related ?

(j) What is supernova explosion ?


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Answer 1

Answer:

1. First of all, a light-year is the distance light travels in one year. The star Alpha Centauri is about 4 light-years away, so light from Alpha Centauri takes 4 years to get to the Earth.
2. The sun is much like a nuclear power reactor which is self-regulating itself. Gas pressure is mandatory for the sun for interacting and maintaining a state of dynamic equilibrium. ... The balance will be lost if there is no gas pressure. Hence the steady release of light and heat is possible.
3. The Virial Theorem as a Driving Force of Stellar Evolution In phases where there is no nuclear burning, the total energy of a star necessarily decreases because energy is radiatated away from the surface.
4. A star's life cycle is determined by its mass. The larger its mass, the shorter its life cycle. A star's mass is determined by the amount of matter that is available in its nebula, the giant cloud of gas and dust from which it was born.
5. A supernova is the biggest explosion that humans have ever seen. Each blast is the extremely bright, super-powerful explosion of a star. A supernova is the biggest explosion that humans have ever seen. Each blast is the extremely bright, super-powerful explosion of a star.

Answer 2

Answer:

f) 4 light-years

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g)The sun is much like a nuclear power reactor which is self-regulating itself. Gas pressure is mandatory for the sun for interacting and maintaining a state of dynamic equilibrium. ... The balance will be lost if there is no gas pressure. Hence the steady release of light and heat is possible.

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h)The Virial Theorem as a Driving Force of Stellar Evolution In phases where there is no nuclear burning, the total energy of a star necessarily decreases because energy is radiatated away from the surface.

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I)In the case of stars, more massive ones use up their fuel much more quickly than stars of low mass. The reason massive stars are such spendthrifts is that, as we saw above, the rate of fusion depends very strongly on the star's core temperature. ... Higher pressure, in turn, is produced by higher temperature.

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j)A supernova is the biggest explosion that humans have ever seen. Each blast is the extremely bright, super-powerful explosion of a star. A supernova is the biggest explosion that humans have ever seen. Each blast is the extremely bright, super-powerful explosion of a star.

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Explanation:

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