Stars/Violets/Quiz

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This is a violet astronomy image of the Sun. Credit: NASA.

Violet stars is a lecture and an article about the astronomy of stars.

You are free to take this quiz based on violet stars at any time.

To improve your score, read and study the lecture, the links contained within, listed under See also, External links, and in the {{stars resources}} template. This should give you adequate background to get 100 %.

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Enjoy learning by doing!

Quiz[edit | edit source]

  

1 True or False, Regulus is a likely first violet source in Leo.

TRUE
FALSE

2 Complete the text:

Match up the violet or violet containing image with the object letter:
Sun - A
Venus - B
Earth - C
Moon - D
Mars - E
Jupiter - F
Ganymede - G
Io - H
Saturn - I
Dione - J
Titan - K
Uranus - L
Ariel - M
Miranda - N
Triton - O
Eta Carinae - P
NGC 5584 - Q
Miranda3.jpg

.
Titan's Halo PIA07774.jpg

.
Triton's Cryovulcan.jpg

.
Dione color.jpg

.
Voyager 2 - Saturn - 3115 7854 2.png

.
Mars violet sky.jpg

.
Phot-16-07.jpg

.
Vg1 1567237.tiff

.
Eta Carinae.jpg

.
PIA00072 Venus Cloud Patterns - colorized and filtered.jpg

.
Iosurface gal.jpg

.
Uranus rings.png

.
Moon1 gal big.gif

.
Ganymede-moon.jpg

Clements Mountain NPS.jpg

.
Blueberrysun friedman 1296.jpg

.
Ariel color PIA00041.jpg

.

3 True or False, α Sagittarii may be the first detected UV source in the constellation Sagittarius.

TRUE
FALSE

4 Yes or No, The “Purple Haze” is a diffuse blueish/purple glow within a few arcseconds of the central star in HST images of the Homunculus.

Yes
No

5 True or False, Violet stars have radiation that peaks over the wavelength band 380-450 nm.

TRUE
FALSE

6 Which of the following are phenomena associated with violet stars?

photographs of the planet Venus taken in 1927
the purple haze within a few arcseconds of the central star of the Homunculus
the faintness of carbon stars
the stellar abundance of aluminum
adaptive optics
the helium beta line

7 Helium has emission lines in which of the following colors?

violet
blue
cyan
green
yellow
orange
red

8 Hydrogen has emission lines in which of the following colors?

violet
blue
cyan
green
yellow
orange
red

9 Yes or No, Stellar class O stars have surface temperatures high enough that most of their luminescence is in the ultraviolet.

Yes
No

10 Complete the text:

Match up the radiation letter with each of the detector possibilities below:
Optical rays - L
Visual rays - M
Violet rays - N
Blue rays - O
Cyan rays - P
Green rays - Q
Yellow rays - R
Orange rays - S
Red rays - T
multialkali (Na-K-Sb-Cs) photocathode materials

.
F547M

.
F675W

.
broad-band filter centered at 404 nm

.
F588N

.
thallium bromide (TlBr) crystals

.
F606W

.
18 micrometers FWHM at 490 nm

.
wide-gap II-VI semiconductor ZnO doped with Co2+ (Zn1-xCoxO)

.


Hypotheses[edit | edit source]

  1. The current metallicity of a star may depend on the presence of coronal clouds.

See also[edit | edit source]

External links[edit | edit source]

{{Stars resources}}