Radiation astronomy/Plasmas/Quiz

From Wikiversity
Jump to navigation Jump to search
This is a color composite image of NGC 7662. Credit: Judy Schmidt.

Plasma radiation astronomy is a lecture studying astronomical objects consisting of plasma totally or in some portion.

You are free to take this quiz based on plasma-object astronomy 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 {{Radiation astronomy 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[edit | edit source]


1 Complete the text:

A plasma can be created by using

voltages (typically around 1/1000 atmospheric pressure) to

a low pressure gas.

2 Yes or No, Nitrogen has two emission lines that occur in plasmas at 455.368 and 455.545 nm from N VII.


3 Complete the text:

A coronal cloud is a cloud, or cloud-like, natural astronomical entity, composed of

and usually associated with a

or other astronomical object where the temperature is such that

are emitted.

4 True or False, Because of the huge spatiotemporal scales of plasma objects in space, the basic accepted views about the theory of plasma stability, which is now better suited for laboratory applications, are already in need of revision.


5 The population of coronal loops can be directly linked with the?

6 Which of the following is a prominent feature associated with solar clouds?

coronal mass ejections
magnetic clouds
coronal clouds
magnetic field lines

7 Yes or No, In physics and chemistry, plasma is a state of matter similar to gas in which a certain portion of the particles are ionized.


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

9 Yes or No, Plasma is the fourth state of matter, consisting of electrons, ions and neutral atoms, usually at temperatures above 104 degrees Kelvin.


10 When ionization cones are present, what green characteristics are usually readily observed?

O III green emission line
green continua
biconical structure
a common cone axis and apex
ionized gas
neon clouds

11 Yes or No, Blue jets differ from sprites in that they project from the top of the cumulonimbus above a thunderstorm to the lowest levels of the ionosphere.


12 Complete the text:

Blue jets differ from sprites in that they project from the

of the cumulonimbus above a

, typically in a narrow cone, to the lowest levels of the


13 Yes or No, Red sprites tend to be associated with significant lightning strikes.


14 Which of the following is associated with aeronomy?

chemical composition
physical properties
radiation from space

15 Which of the following are associated with X-radiation?

spans three decades in wavelength
spans three decades in frequency
spans three decades in energy
emitted by 26Al
coronal clouds
60 keV electromagnetic radiation
90 eV electromagnetic radiation
visually dark source

16 Yes or No, The Chamaeleon I cloud is a coronal cloud.


17 Which of the following are X-radiation astronomy phenomena associated with the Sun?

a core which emits neutrinos
a solar wind which emanates out the polar coronal holes
the barycenter for the solar system
polar coronal holes
coronal clouds
its position
temperatures at or above 1 MK

18 Complete the text:

The photosphere of the Sun has an effective temperature of

yet its corona has an average temperature of

. The high temperature of the corona shows that it is heated by something other than direct

from the photosphere.

See also[edit | edit source]

External links[edit | edit source]