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Terms in this set (22)
Use the interactive to determine which elements or molecules are present in the observed spectrum of an A-type star. Sort the elements and molecules into the appropriate categories below.
An A-type star spectrum...
Shows this present:
Neutral hydrogen (HI)
ionized magnesium (MGII)
Does NOT shoe this:
Ionized iron (Fe II)
titanium oxide (TiO)
ionized helium ( He II)
neutral calcium (Ca I)
Arrange the following regions of the electromagnetic spectrum from LOWEST TO HIGHEST frequency.
Radio, infrared, optical, ultraviolet, x-ray, GammaRay.
Which of the following are NOT found in the electromagnetic spectrum.
Sound waves, cosmic rays.
The presence of dark lines at specific wavelengths and otherwise continuous spectrum can be explained most easily by which of the following?
A cool gas between observer and source is absorbing light at the wave links corresponding to the missing photons.
The formation of absorption lines in a spectrum emitted by a blackbody indicates which of the following?
The specific elements of the atoms present in an intervening cloud.
The existence of an intervening cloud of material cooler than a meeting source.
The interaction of matter and light.
Compare the spectra of blackbodies with different temperatures. Which of the following is true?
The peak of the emission in the spectrum of the cooler object is at a longer wavelength.
Use the interactive to determine which kinds of stars show neutral calcium (Ca I) in their observed Spectra. Sort the stars into the appropriate categories below.
Show's Ca I:
K - type star
Does NOT show Ca I:
In observing an oxygen emission line from a warm gas cloud that is expected to appear at 500 NM, the line is seen at 525 NM instead (5% longer). Which of the following is true?
The object is moving away from the observer at 5% of the speed of light.
Experiment with both use in the interactive and determine which statements below are true.
The wavelength observed will lengthen is the distance between the observer and the wave source is increasing, regardless of which is moving.
The wavelength observed will shorten at the distance between the observer and the wave source is decreasing, regardless of which is moving.
The Hubblium is seen in the specter of four galaxies, as redshifted. Sort these galaxies by how fast they are moving away from us, from fast (at the top) to slow (at the bottom).
I will describe the far left side of the colorful spectrums...
1) No line on purple or dark blue part of spectrum
2) line on medium purple part of spectrum
3) line on pure purple part of spectrum
4) two lines on medium purple/ dark blue part of spectrum
(Sorry can't upload pictures)
A spectrum of a distance object reveals a sequence of known absorption lines that are shifted to shorter wavelengths. What can be concluded about the object?
It must be moving toward us.
Imagine decreasing the size of the lens in the figure above. Which choice below best describes what would happen?
The less total light from the source will hit the lens, making it appear fainter on the detector.
Given that gravity pause downward at every point on the lens or mirror, select the telescope type that can get larger (more massive) still retain its shape.
The reflective one that says, " focal plane & focal length"
Based on the above graph, which of these types of light from astronomical sources are not observable from the ground?
Ultraviolet at 100 nm
infrared at 100 no (10-4m)
Space telescopes that exist in orbit above most of the earths atmosphere are expensive, so they must therefore be supported with a very compelling motivation. If you were trying to justify funding for a space telescope in orbit around the earth, which of the following would be the best argument to use?
The telescope could observe wavelengths of light that are not visible from the ground.
If there were two telescopes with the same diameter, but one is visible light telescope and the other a radiotelescope, how would the resolution of the images from each telescope compare?
The radiotelescope would have much worse angular resolution.
The resolution of radio telescopes suffered greatly from the large wavelengths of the light they are observing. What can be done to a radiotelescope to improve its angular resolution?
Make its dish bigger.
categorize the following NASA space-based observatories by the wavelength of light they were designed to observe at.
infrared: James Webb and Spitzer
Categorize the wavelengths of light by how transparent the earths atmosphere is at those wavelength.
Which of these NASA-based observatories was designed primarily to study wavelengths of light to which earths atmosphere is transparent?
For each of the five possible astronomical targets place them on the figure of wavelength versus A Thomas Feerick opacity based on the wavelength you would most easily observe them at.
From left to right: C,E,A,B,D.
Classify each of the five objects you considered in part one based on whether you need a space-based observatory to see them or not.
Seen from space:
Planets, starforming clouds
gamma Ray burst
black hole accretion disk
seen from ground:
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