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Interstellar gas is composed greatly of 1)A) only hydrogen.B) ammonia, methane, and water vapor.C) 10% hydrogen, 90% helium by numbers of atoms.D) part hydrogen, yet mainly carbon dioxide.E) 90% hydrogen, 9% helium by weight.
What happens to irradiate passing through even thin clouds that dust? 2)A) its motion reasons the irradiate of stars past to twinkle.B) its motion reasons all irradiate to it is in red shifted together it passes with these clouds.C) that dims and also reddens the light of all an ext distant stars.D) The light the passes though them is blue shifted as result of the cloud"s approach.E) also a little can fully block all light, such as the Horsehead Nebula.
i m sorry statement about dark dust clouds is true? 3)A) They have the right to be penetrated just with much longer wavelengths such together radio and also infrared.B) They comprise the bulk of the fixed of the Galaxy.C) They can be penetrated just with much shorter waves, such together UV and X-ray.D) Hydrogen and helium room the chief taking in and scattering agents.E) lock block the vast bulk of radio tide from our Galaxy.
Some areas along the airplane of the Milky method appear dark due to the fact that 4)A) plenty of black feet absorb every light indigenous those directions.B) there are no stars in this areas.C) stars in that an ar are surprise by dark dust particles.D) many brown dwarfs in those locations absorb light, which lock turn right into heat.E) stars in that region are surprise by interstellar gas.
emissions nebulae choose M42 occur only close to stars the emit huge amounts the 5)A) X-rays and also gamma rays.B) clearly shows light.C) infrared heat.D) ultraviolet radiation.E) microwaves.
What is the main visible shade of an emission nebula? 6)A) blue due to ionized helium atomsB) blue indigenous the scattering that light off the tiny moleculesC) black, due to the fact that of dustD) red since of reddening by dustE) red as result of ionized hydrogen atoms
as result of absorption of much shorter wavelengths by interstellar dust clouds, remote stars appear 7)A) brighter.B) bluer.C) redder.D) larger.E) to have a higher radial velocity.
The spectra the interstellar gas clouds display that they have actually the same basic composition together 8)A) interstellar dust.B) Earth"s atmosphere.C) the Martian polar caps.D) stars.E) nobody of the above.
i beg your pardon statement is true around the interstellar medium? 9)A) Dust is spread out uniformly v the galaxy.B) Dust blocks the longest electromagnetic wavelengths.C) Gas obscures the irradiate from remote stars.D) us know an ext about the gas than the dust.E) Gas consists of a most carbon atoms.
The thickness of interstellar dust is an extremely low, however it still block starlight because 10)A) the dust particles are irregular in shape.B) it is so cold that absorbs higher energy photons.C) over there is 100 times much more opaque gas 보다 dust current in the ISM.D) the dust corpuscle are around the same size together the light waves lock absorb.E) ice cream particles reflect every light ago toward your stars, not towards us.
What two things are needed to develop an emission nebulae? 11)A) warm stars and interstellar gas, an especially hydrogenB) hydrogen blend and helium ionizationC) interstellar gas and also dustD) cool stars and much interstellar dustE) hydrogen gas and also carbon dust
A big gas cloud in the interstellar medium that consists of several kind O and also B stars would appearto united state as12)A) a dark patch against a glowing background.B) a dark nebula.C) a enjoy nebula.D) an emissions nebula.E) glowing blue.
Neutral hydrogen atoms are ideal studied from their energy given off as 13)A) Neutral hydrogen gives off no detectable radiation, because it is cold, no hot.B) 0.2 nm as X-rays.C) 121.3 nm as Lyman alpha emissions in the UV.D) 21-cm tide in the radio region.E) red hydrogen alpha emission, in ~ 656.3 nm.
complicated molecules in the interstellar medium are found 14)A) only approximately the supergiant stars favor Betelgeuse the make their hefty atoms.B) uniformly transparent the decaying of the Galaxy.C) generally in the dense dust clouds.D) ~ above the surface of the coolest class K and M stars only.E) scattered evenly throughout the universe, a product the the large Bang itself.
Why are dark dust clouds greatly misnamed? 15)A) The cloud is one illusion, for the dust is evenly distributed roughly the Galaxy.B) it is ice, not dust, which do them watch dark.C) Dust clouds execute radiate energy, however not as lot light as the stars do.D) castle contain much an ext gas than dust.E) all of the over are correct.
The typical temperature that the usual dark regions in an are are 16)A) 3,000 K. B) 0 K. C) 2.73 K. D) 100 K. E) 6,000 K.
when an electron in hydrogen transforms its spin from the exact same to the opposite direction together theproton, it17)A) no emits nor absorbs a photon.B) absorbs a radio wave photon.C) emits one X-ray photon.D) absorbs a visible light photon.E) emits a radio wave photon.
Interstellar dust clouds are ideal observed in ~ what wavelength? 18)A) clearly shows onlyB) Visible and UVC) UV and infraredD) Radio and X-rayE) Radio
i beg your pardon of this is no a consequence of dust in the interstellar medium? 19)A) red light from the emission nebulaeB) reddening the stars" light that passes v the dustC) the dark nebulae that block 90% of the Milky means from united state visuallyD) blue reflection nebulae roughly the PleiadesE) all of these room consequences.
it is important to research interstellar dust due to the fact that 20)A) there is nearly as lot mass between the stars as therre is in them.B) this is whereby stars are formed.C) old stars expel their matter right here when lock die.D) every one of the above.E) the not important at all.
reflection nebula have actually their blue colour because 21)A) lock are very high temperature.B) the interstellar dust absorbs the red light.C) the interstellar dust deflects the blue light.D) helium is the main absorber and emits irradiate in this colour.E) lock are an extremely low temperature.
What is true of emission nebula? 22)A) they space often part of much bigger interstellar clouds.B) their temperature deserve to exceed that of our sun.C) they space bigger than earth.D) they create an emission spectrum.E) every one of the above.
throughout the T-Tauri step of a protostar, it 1)A) lies ~ above the main sequence.B) may build very strong winds.C) broadens dramatically.D) starts a duration of decreased activity.E) changes its rotate direction.
What is the crucial core temperature compelled for fusion? 2)A) 5,800 KB) 10 million KC) 3,000 KD) 100 million KE) 1 million K
i m sorry statement about the stages of starbirth is false? 3)A) atom reactions start in the core by phase 4.B) The T-Tauri wind is prevalent in phase 5.C) By phase 3, the star has developed a photosphere.D) At stage 1, only the cloud exists.E) By stage 7, the star has reached the main sequence.
On one H-R diagram, a protostar would certainly be 4)A) above and near the upper left of the main sequence.B) over and to the best of the key sequence.C) on the key sequence in ~ the extreme lower right.D) below and also to the left that the key sequence.E) below and also near the right side that the key sequence.
The solitary most crucial determinant the the temperature, density, radius, luminosity,and pace of advancement of a protostar is its5)A) magnetic field.B) molecule composition.C) mass.D) spin.E) chemical composition.
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