Radiation astronomy/Absorptions/Quiz

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Aquamarine is a blue or turquoise variety of beryl. Credit: Vassil.

Absorption astronomy is a lecture as part of the department of radiation astronomy course on the principles of radiation astronomy.

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Quiz[edit | edit source]

  

1 Which of the following emission/absorption phenomena are associated with radiation astronomy?

helium lines at 501 and 505 nm
the strong C2 (1,2) band
nitrogen emission in plasmas at 566.934 nm from N VIII
helium emission line at 5876 Å
neutral iron line at 526.96 nm
calcium yellow line at 569.4 nm

2 Which of the following is a phenomenon associated with yellow astronomy?

Jupiter
sodium line emission
sunspots on the Sun
an emission with a wavelength of 420 nm
phosphorus
TiO

3 Which chemical phenomenon are associated with the Earth?

quartz is the second most abundant mineral
an atmosphere containing CO2
green, red, blue, and yellow airglow
the production and escape of hot H+ ions
oxygen emissions
helium ions

4 Complete the text:

The detection of absorption by interstellar

in the

band occurs along the sight line to the submillimeter continuum sources W49N and W51.

5 True or False, The absorption and reradiation of light by dust in the history of galaxy formation and evolution is the submillimeter extragalactic background light (EBL).

TRUE
FALSE

6 The extent of the Hα absorption trough along the major axes of quenched spirals is what?

more truncated than the distribution of the Hα emission line for H I deficient galaxies
contributed to by the new stellar population
less truncated than the distribution of the Hα emission line for H I deficient galaxies
due to the quenching
disks building up from the outside in

7 Complete the text:

The solar occultation for

experiment (SOFIE) is an

radiometer experiment that uses a differential absorption technique in solar occultation (

and sunset).

8 Observations of comets have benefited greatly from what phenomenon of cyan astronomy?

Cherenkov radiation
the electric blue glow of lightning
gas-expansion velocity decreases with increasing heliocentric distance
methane possesses prominent absorption bands in the visible
adaptive optics
the light of the neutral CN-radical

9 Complete the text:

Methane possesses prominant

in the visible and near-infrared (IR) making

aquamarine or

in color.

10 Which of the following emission/absorption phenomena are associated with green astronomy?

Helium lines at 501 and 505 nm
the strong C2 (1,2) band
nitrogen emission in plasmas at 566.934 nm from N VIII
Helium emission line at 5876 Å
neutral iron line at 526.96 nm
Calcium yellow line at 569.4 nm

11 Complete the text:

In the case of electric

radiation, the associated fluctuation in angular

is due to absorption of and decays stimulated by

photons (dominated by Cosmic Microwave Background (CMB) photons in the

interstellar

(ISM).

12 Which of the following emission/absorption phenomena are associated with yellow astronomy?

Nitrogen emission line at 575.5 nm
the strong C2 (1,2) band
nitrogen emission in plasmas at 566.934 nm from N VIII
Helium emission line at 5876 Å
neutral iron line at 526.96 nm
Calcium yellow line at 569.4 nm

13 Spin-charge separation has which characteristics?

a chargon
a spinon
taking place inside solids
extremely tight confinement
neutron affinity
X-ray absorption

14 Which of the following are associated with classical Cepheids as a standard candle?

characteristic mottling
young, disk objects
recent star formation
incipient resolution
pulsation phenomenon
easy to recognize
correction for absorption

15 True or False, The standard candle being used in 1977 for spectral region K5-M4 is the CN (cyanide) index from the CN absorption in selected bands.

TRUE
FALSE

16 Complete the text:

Match up the type of source with each of the possibilities below:
a source - A
a source or apparent source detected or created at or near the time of the event or events - B
a source or apparent source that transforms or transduces anything originating from a primary source - C
a source or apparent source that selects (such as through selective absorption), distills, scatters, or reflects anything from a primary or secondary source - D
the point of origin of a ray, beam, or stream of small cross section traveling in a line - E
a natural source in the sky especially at night - F
a tertiary source

.
a primary source

.
an astronomical source

.
a secondary source

.
a radiation source

an entity from which something comes or is acquired

.

17 Supernovae of Type Ia lack hydrogen lines and helium lines in their optical spectra; during the first month after maximum light they do have a strong absorption feature produced by the red doublet (λ6347, λ6371 Å) of singly ionized?

.

18 Phenomena associated with some brown dwarfs are which of the following?

lithium
a temperature well below the stellar range
methane absorption
the lithium test
X-rays
T dwarfs

19 Mathematical phenomena associated with an exponential decrease are

a positive exponent
a negative absorption coefficient
the number of atoms per cm3
the initial absorption of a monolayer
the absorption cross section in cm2
thinness of material

20 Complete the text:

The spectral region bounded on the long wavelength side by the atmospheric

absorption and on the short wavelength side by the photoionization of interstellar

is the ultraviolet.

21 Which of the following is not a characteristic of super soft X-radiation?

electromagnetic radiation
ionizing radiation
usually hidden by interstellar absorption in the galactic disk
readily evident in external galaxies
have energies in the 0.09 to 2.5 keV range

22 Which of the following is not a phenomenon associated with the history of violet astronomy?

photographs of the planet Venus taken in 1927
two nebulous bright streaks running approximately perpendicular to the terminator on Venus
observations of Venus in 1959 with spectrographs show a wide continuous absorption
the stellar abundance of aluminum
the Galileo spacecraft observed Venus
the helium beta line

23 TeV muons from gamma-ray primaries are rare because?

only produced by higher energy gamma rays
suppressed gamma-ray flux
decreasing flux at the source
GeV gamma rays
absorption
interstellar light

24 Which of the following are associated with solar limb faculae?

calcium emission lines
TiO absorption lines
chromium emission lines
Fe emission lines
a decrease in redness
emission lines of Ti

25 An entity in X-ray astronomy may be a researcher who turns on an X-ray generator to study X-ray emission, ?


Hypotheses[edit | edit source]

  1. Yellow wavelengths help identify elements like sulfur by absorption.

See also[edit | edit source]

External links[edit | edit source]

{{Radiation astronomy resources}}