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Delvig [45]
3 years ago
8

3. Which of the following statements about features on the sun is true?

Physics
2 answers:
EleoNora [17]3 years ago
8 0
Let's see your options:

a) prominences are gas eruptions that can form an arch and do not look dark, therefore this statement is false;
<span>b) solar flares</span> are spots hotter than the surrounding, therefore they are brighter than the rest, and they form where prominences start or end on the surface, therefore this statement is true;
c) the number of sunspots may vary following an 11 years cycle, therefore this statement is false;
d) sunspots are colder spots on the surface and have nothing to do with solar winds, therefore this statement is false.

Readme [11.4K]3 years ago
5 0
Correct answer choice is:

b) Solar flares are spots hotter than the surrounding, therefore they are brighter than the rest, and they form where prominences start or end on the surface.

Solar flares eject coronal mass, they eject electrons, protons, and ions from the Sun. They<span> produce high energy particles and radiation that are dangerous to living organisms. </span>The earth encompasses a natural protection against these charged particles. Earth's magnetic field and atmosphere protect us from these particles.
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Degger [83]

Answer:

Angle of refraction

Explanation:

The incident ray is the ray before it reaches the surface.

The refracted ray is the ray after it reaches the surface.

n₁ is called the index of incidence.

n₂ is called the index of refraction.

θ₁ is called the angle of incidence.

θ₂ is called the angle of refraction.

They are related by Snell's law:

n₁ sin θ₁ = n₂ sin θ₂

5 0
3 years ago
Read 2 more answers
Blood is 92% water. Blood is
Pepsi [2]

Answer:

Plasma, which constitutes 55% of blood fluid, is mostly water (92% by volume), and contains proteins, glucose, mineral ions, hormones, carbon dioxide (plasma being the main medium for excretory product transportation), and blood cells themselves.

Explanation:

6 0
3 years ago
A hydrogen atom that has an electron in the n = 2 state absorbs a photon. What wavelength must the photon possess to send the el
Deffense [45]

Answer:

486nm

Explanation:

in order for an electron to transit from one level to another, the wavelength emitted is given by Rydberg Equation which states that

\frac{1}{wavelength}=R.[\frac{1}{n_{f}^{2} } -\frac{1}{n_{i}^{2} }] \\n_{f}=2\\n_{i}=4\\R=Rydberg constant =1.097*10^{7}m^{-1}\\subtitiute \\\frac{1}{wavelength}=1.097*10^{7}[\frac{1}{2^{2} } -\frac{1}{4^{2}}]\\\frac{1}{wavelength}= 1.097*10^{7}*0.1875\\\frac{1}{wavelength}= 2.06*10^{6}\\wavelength=4.86*10{-7}m\\wavelength= 486nm\\

Hence the photon must possess a wavelength of 486nm in order to send the electron to the n=4 state

4 0
3 years ago
Define mixture, heterogeneous, homogeneous, solution, colloid, suspension, solvent, solute, saturation.( please don't answer the
oksano4ka [1.4K]

Answer:

1) a substance made by mixing other substances together.

2) diverse in character or content.

3) of the same kind; alike.

4) a means of solving a problem or dealing with a difficult situation.

5) a homogeneous noncrystalline substance consisting of large molecules or ultramicroscopic particles of one substance dispersed through a second substance. Colloids include gels, sols, and emulsions; the particles do not settle, and cannot be separated out by ordinary filtering or centrifuging like those in a suspension.

4 0
3 years ago
Read 2 more answers
Cosmic inflation refers to ____(A) the current period of cosmic acceleration.(B) stellar winds creating bubbles of gas.(C) the U
Brilliant_brown [7]

Answer:

(D) a brief early period of hyper rapid expansion of space-time.

Explanation:

Cosmic inflation is a theory which states that in an interval of 10⁻³⁶ seconds to around 10⁻³³ seconds after the big bang there was a massive expansion.

According to the big bang theory the universe came to be from a singularity i.e., a point of infinite gravitational field. The universe is expanding this means that according to the conservation of energy the universe was expanding from the beginning.

8 0
3 years ago
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