<span>The electromagnetic emissions from solar flares aren't much different from those produced by the rest of the sun, but do include somewhat higher levels of soft x-rays and low-energy gamma rays. These emissions are of course dwarfed by the normal output of the sun, and are of such low density by the time they reach Earth that they have no discernible effect on organic matter. </span>
The yangtze river is the world’s third-largest river and is used extensively as a trade avenue. The given statement is true.
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What is trade avenue?</h3>
Trade avenue is a street or road used to do trading or exchange of goods.
Yangtze river is in China. It runs for 3900 miles right from the Tibetan Plateau to the estuary of East China near to Shanghai.
The Yangtze river is the world’s third-largest river and is used extensively as a trade avenue.
Thus, the statement is true.
Learn more about trade avenue.
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Answer:
C) A low-density, cool gas in isolation creates a continuous spectrum.
Explanation:
Kirchhoff’s laws established that:
- A solid, liquid or dense incandescent gas emits a continuous spectrum.
- A hot and diffuse gas produces bright spectral lines (emission lines).
- A gas of lower temperature against a source of continuum spectrum, produces dark spectral lines (absorption lines) superposed in the continuum spectrum.
Stars are perfect examples for Kirchhoff’s laws. Since in the case of the stars, the photons that are received are not directly from the nucleus, but those that have traveled hundreds of thousands of years to reach the stellar atmosphere. Due to the stars are not at homogeneous temperature, density and pressure, but have gradients in different layers because of the nuclear reactions, superficial gravity or to its constant exchange of heat with its surroundings in an attempt to reach the thermodynamic equilibrium, the continuum observed in the stellar spectra comes from the inner layer of the photosphere, while absorption lines are formed in the outer layer of the photosphere and the stellar atmosphere. More accurately, a photon of the inner layer of the photosphere will be absorbed by an electron of an atom or ion that is in the outer layer, generating an electronic transition¹, the electron, upon returning to its base state will emit a photon or a series of photons that will not necessarily go in the same direction of the incident photon, creating an absorption line in the stellar spectrum.
On the other hand, in the case where the stars have surrounding material (diffuse gas), the atoms, molecules or ions in the medium are excited by the radiation that comes from the stellar atmosphere, thus producing an emission spectrum.
Key terms:
¹Electronic transition: When an electron passes from one energy level to another, either for the emission or absorption of a photon.
Answer:
It is just a theory that multi verse exists. Researchers have found tracers of mirror particles which could only be from other universe.
Explanation:
Its said above.
