Astronomy 120 - Stars and Galaxies » Fall 2022 » Test No. 2

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Question #1
Sun spots are most closely associated with
A.   thermonuclear fusion.
B.   coronal mass ejections.
C.   solar flares.
D.   magnetic fields.
Question #2
The blackbody spectrum of the Sun peaks in which part of the electromagnetic spectrum?
A.   visible
B.   infrared
C.   ultraviolet
D.   x-ray
Question #3
What can we determine by the parallax angle of a star?
A.   The star's composition.
B.   The star's intensity.
C.   The star's distance.
D.   The star's temperature.
Question #4
The parallaxes of nearby stars are produced by
A.   Earth's revolution (orbit) around the sun.
B.   stellar motion across our line of sight.
C.   stellar motion along our line of sight.
D.   Earth's rotation (spin) on its axis.
Question #5
According to table below, which star appears the brightest to those living in Glendale? Star Absolute Magnitude (M) Apparent Magnitude (m) Star A –3.2 3.2 Star B 1.5 7.5 Star C 4.9 4.9 Star D –5.1 0.5
A.   Star B
B.   Star A
C.   Star D
D.   Star C
Question #6
You have discovered a new star. This star's hydrogen lines (the Fraunhofer lines caused by electron transitions within hydrogen atoms) were seen to be very wide. This identifies the star as a
A.   main sequence star
B.   supergiant star
C.   protostar
D.   Bok globule
Question #7
Stars in the upper left corner of the HR diagram are
A.   hot and bright.
B.   cool and dim.
C.   hot and dim.
D.   cool and bright.
Question #8
Stars form within nebulae that emit
A.   ultraviolet light.
B.   2.6 mm or 1.3 mm wavelengths.
C.   21 cm light.
D.   visible light.
Question #9
HII regions, also known as emission nebulae, are famous for
A.   their noxious (unpleasant) odor from emissions.
B.   their colorful appearance.
C.   their cool temperature.
D.   their location, far from any stars.
Question #10
What are the pre-main sequence evolutionary paths of stars on the HR Diagram called?
A.   Newton trails
B.   Morimoto remnants
C.   Lee lines
D.   Hayashi tracks
Question #11
There are stars that are brighter than the Sun.
A.   True
B.   False
Question #12
The mass of a red giant star can be determined from its placement on the HR diagram.
A.   True
B.   False
Question #13
The dust in the ISM within the galaxy is smaller in size than the hydrogen molecules of the molecular nebulae within the galaxy.
A.   True
B.   False
Question #14
If a star was moved twice as far from us as it presently is, it would appear half as bright.
A.   True
B.   False

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