Stars/Violets/Quiz

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

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

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 %.

As a "learning by doing" resource, this quiz helps you to assess your knowledge and understanding of the information, and it is a quiz you may take over and over as a learning resource to improve your knowledge, understanding, test-taking skills, and your score.

Suggestion: Have the lecture available in a separate window.

To master the information and use only your memory while taking the quiz, try rewriting the information from more familiar points of view, or be creative with association.

Enjoy learning by doing!

Quiz

Point added for a correct answer:
Points for an incorrect answer:
Ignore the questions' coefficients:

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

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

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

Main article: Hypotheses

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

See also

• Green astronomy/Quiz
• Planetary science/Quiz
• Radiation astrochemistry/Quiz
• Radiation astrogeography/Quiz
• Radiation astrohistory/Quiz
• Radiation astronomy/Quiz
• Theoretical radiation astronomy/Quiz

External links

• International Astronomical Union
• NASA/IPAC Extragalactic Database - NED
• NASA's National Space Science Data Center
• The SAO/NASA Astrophysics Data System
• SDSS Quick Look tool: SkyServer
• SIMBAD Astronomical Database
• SIMBAD Web interface, Harvard alternate
• Spacecraft Query at NASA.
• Universal coordinate converter

{{Stars resources}}