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ASTR 114
Old Test
16
Astronomy
Undergraduate 2
10/30/2008

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Cards

Term
The limitation to the size of the objective of a refracting telescope is due to
Definition
Gravity
Term
The most important function of the astronomical telescope is
Definition
light gathering power
Term
Percival Lowell had an observatory built near Flagstaff, AZ so he could study the planet
Definition
Mars
Term
The person to use the telescope for scientific investigation was Galileo. T or F?
Definition
False
Term
The 11 year sunspot cycle is based on the number of sunspots only. T or F?
Definition
True
Term
Prominences are formed near (2)...
Definition
sunspot groups AND active regions of the sun
Term
A solar magnetic cycle takes, on average, this many years to complete.
Definition
22
Term
Sunspots appear to be dark because
Definition
they are lower in temperature than the surrounding photosphere
Term
Granules are (2)...
Definition
the tops of convection cells AND the source of spicules
Term
the largest part of the sun is the ____.
Definition
corona
Term
In which ways does the Sun affect the Earth?
Definition
1. SIDS 2. Aurora 3.Geomagnetic Field 4. Power Grids (also, sudden ionospheric disturbances and heating of the atmosphere)
Term
The peak wavelength in the blackbody spectrum of a star with a spectral temperature of 5780k is
Definition
5 x 10^-7 meter
Term
A star's actual distance is 100parsecs. Which will be more negative, the star's apparent magnitude or absolute magnitude?
Definition
Apparent (I think this answer might be wrong)
Term
Approximately how many times brighter is a star of magnitude +2 compared to one of +6?
Definition
6-2=4 so 2.512^4, on front sheet it tells you 40. 40 times brighter
Term
On the H-R diagram main sequence, moving from lower right to upper left, what stellar properties increase? (4)
Definition
1. Mass 2. Radius 3.Luminosity 4. Spectral Temp
Term
T or F? On the H-R diagram, as the absolute magnitude scale becomes more negative, the luminosity scale shows an increase in the luminosity of the stars.
Definition
True
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