Stars/Quiz - Wikiversity

Stars is a lecture about an entity, source, and/or object observed using radiation astronomy.

HD 12545 exhibits the largest starspots yet observed. Credit: K. Strassmeier (U. Wien), Coude Feed Telescope, AURA, NOAO, NSF.

You are free to take this quiz based on stars. Once you've read and studied it, the links contained within, listed under See also, External links and the {{stars resources}} template, you should have adequate background to score 100 %.

Enjoy learning by doing!

1 Quiz
2 Hypotheses
3 See also
4 External links

Quiz

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1 Which of the following are radiation astronomy phenomena associated with a star?

	ultraviolet emission
	X-ray emission
	gamma-ray emission
	neutron emission
	⁷Be emission
	meteor emission

2 Yes or No, The Norikura Solar Observatory uses its own designations for solar active regions rather than those of other observatories or NOAA.

	Yes
	No

3 Which of the following is not a characteristic of solar active regions?

	lithium
	nucleosynthesis
	coronal clouds
	spot central meridian passage
	a surface coverage of at least 95%.

4 During the late 1600s the sunspot cycle lost its usual intensity and became what?

5 True or False, Naked starspots seen in Hα which are devoid of plage are never associated with coronal holes.

	TRUE
	FALSE

6 The Sun as a star has what geographical property?

	it's a primordial population III star
	it passes once a year across the Lockman Hole
	silicates have been discovered in its interior structure
	optical reflectance studies have found evidence of magnesium
	it has a surface temperature of ~700 K
	it has a longitude and latitude grid system for locating surface features

7 Complete the text:

Early spectroscopy of the Sun using estimates of the

of several lines by eye to derive the

of elements concluded that the

is largely made of

8 True or False, Any small luminous dot appearing in the cloudless portion of the night sky, especially with a fixed location relative to other such dots is most likely to be a galaxy.

	TRUE
	FALSE

9 When faculae are present, what characteristics are readily observed?

	bright spots
	bright patches
	granules
	temporary increases in TSI
	arising between granules
	neon clouds

10 In each latitudinal hemisphere for the greater part of the starspot period there is practically but one what?

11 True or False, At least in sodium emission astronomy, Mercury is a dwarf gaseous object.

	TRUE
	FALSE

12 Which of the following is not a prominent feature associated with stellar clouds?

	coronal mass ejections
	magnetic clouds
	rotation
	coronal clouds
	plasma
	magnetic field lines

13 In general there is no proper motion at all in the plage or the surrounding?

14 True or False, "Some prominences break apart and give rise to coronal mass ejections."

	TRUE
	FALSE

15 Which of the following is not a phenomenon usually associated with starspots?

	a photosphere
	a hole in the granulated photosphere
	production of ⁷Be
	rotation
	starspot cycle
	sunspots
	flip-flop cycle

16 Complete the text:

"When a prominence is viewed from a different perspective so that it is against the

instead of against space, it appears

than the surrounding

17 True or False, In 1947, G. E. Kron proposed that starspots were the reason for periodic changes in brightness on blue dwarfs.

	TRUE
	FALSE

18 Which of the following is not a phenomenon associated with a flip-flop cycle?

	active regions
	hemisphere shifts
	binary RS CVn stars
	single stars
	cyclical period
	meridian passage

19 A Mt. Wilson spot number usually corresponds with which other region number?

20 True or False, Hale region numbers are greater for the same regions than NOAA numbers.

	TRUE
	FALSE

21 Which of the following sunspot phenomena are associated with the Maunder minimum?

	extensively long quiet Sun
	lowest ¹⁴C concentration from as far back as 3100 b2k.
	a period of lower-than-average European temperatures
	a surface coverage of about 88%
	only about 50 sunspots during one 30-year period
	11-year cycles

22 Stellar observation is performed all around the surface of the Earth by?

23 True or False, The Kodaikanal Solar Observatory is a solar observatory owned and operated by the Indian Institute of Astrophysics.

	TRUE
	FALSE

24 Which of the following are phenomena usually associated with a heliostat?

	geographic coordinates
	a mirror which turns so as to keep reflecting sunlight toward a predetermined target
	the target is usually stationary
	computer control
	a two-axis motorized system
	altitude

25 Naked spots are long-lived and show rotation rates close to what?

26 True or False, Helicity (H) is a quantitative measure of the chiral properties of the structures observed in the solar atmosphere.

	TRUE
	FALSE

27 Which of the following are associated with a stellar control group?

	rocky objects
	gaseous objects
	plasma objects
	a photosphere
	rotation
	watery surface
	spots

28 The relative abundances of solar cosmic rays reflect those of the solar

29 True or False, The surface of a star is a known source of neutrons.

	TRUE
	FALSE

30 Which of the following are characteristic of stellar proton astronomy?

	the solar wind
	polar coronal holes
	protons originating from the photosphere
	the electron neutrino
	GOES 11
	neutrons

31 Using a coordinate system, starspot passage is generally noted by what meridian?

32 True or False, "75% of the naked sunspots represented the return of large dominant f spots which had been part of large active regions during previous rotations."

	TRUE
	FALSE

33 Which geographical phenomena are associated with starspots?

	moving across the surface of the star
	manifesting intense magnetic fields
	a north geographic and magnetic pole
	rotation
	a prime meridian
	average starspot latitudes
	the stellar equator

34 Neutrinos detected from the solar octant may be from nucleosynthesis within the coronal cloud in the near vicinity of the Sun or perhaps from nucleosynthesis occurring within what theoretical interior structure of the Sun?

35 True or False, X-ray photons can be effectively backscattered by photosphere atoms and electrons.

	TRUE
	FALSE

36 Phenomena associated with the color index?

	a simple numerical expression
	the magnitude of an object
	a set of passbands or filters
	brightenings
	UBVRI filters
	particular combinations of glass filters and photomultiplier tubes

37 The Na I green lines at 568.2 and 568.8 nm arise in the what?

38 True or False, Stars of spectral classes F and G, such as our sun, have color temperatures that make them look "greenish".

	TRUE
	FALSE

39 Which of the following are photospheric observatories on Earth?

	Chandra X-ray Observatory
	Big Bear
	TRACE
	Kodaikanal
	the Hubble
	Lomnický štít
	McMath-Pierce
	SOFIA

40 Sayan Observatory is located in.

41 True or False, Some observed properties of the Sun still defy explanation, such as the degree of Li depletion: the solar Li abundance is roughly a factor of 200 below the meteoritic abundance.

	TRUE
	FALSE

42 Which of the following are associated with the McMath-Pierce Solar Telescope?

	a launch location
	Kitt Peak National Observatory
	a heliostat
	a distinctive diagonal shaft that continues underground
	a theoretical resolution of 0.07"
	NOAA designations

43 The metallicity is often expressed as "[Fe/H]", which represents the what of the ratio?

44 True or False, Astrognosy is the composition of a star.

	TRUE
	FALSE

45 Which of the following observatories are solar observatories?

	The Huairou Solar Observing Station in China
	Mauna Loa Solar Observatory
	Los Alamos National Solar Laboratory
	National Solar Observatory
	Mees Solar Observatory
	CERN

46 About one third of solar ejecta observed by satellites at Earth is composed of what?

47 True or False, A spotless flare may occur in a plage region during its first rotation.

	TRUE
	FALSE

48 Which of the following are stellar observatory satellites?

	Einstein Observatory
	OSO 7
	Hinode
	High Energy Astronomy Observatory 1
	Koronas-Foton
	STEREO

49 Suborbital stellar probing may be accomplished from different geographical locations on Earth using?

50 True or False, The Mauna Kea Observatories are used for scientific research across the electromagnetic spectrum from visible light to radio, and comprise the largest such facility in the world.

	TRUE
	FALSE

51 Which series of emission lines from hydrogen often occur in the visible spectrum of a star?

	Paschen series
	Brackett series
	Pfund series
	Lyman series
	Humphreys series
	Rydberg series
	Balmer series

52 True or False, Helium does not occur in the photosphere because it was first detected during a stellar eclipse.

	TRUE
	FALSE

53 Which of the following phenomena are associated with the core of a star?

	origin of the magnetic field
	the convection zone
	the tachocline
	stellar neutrinos
	radiative zone
	gamma-rays

54 True or False, Astrography is the geography of a star.

	TRUE
	FALSE

55 Which of the following are green radiation astronomy phenomena associated with the Sun?

	the color of the upper rim as seen from Earth
	an excess brightness at or near the edge of the Sun
	the iron XIV green line
	neutron emission
	polar coronal holes
	meteor emission
	changes in the line-blanketing

56 True or False, The Sun has a net positive charge on its surface.

	TRUE
	FALSE

57 True or False, The Hβ emission line does not appear when the F492M filter is used on the Hubble Space Telescope because its wavelength is 486.1 nm.