AST1002 EXAM 2 UF - 129 QUESTIONS WITH COMPLETE SOLUTION.
The Sun's surface, as we see it with our eyes, is called the ________________. - (answer)photosphere
Io's surface appears very smooth because it - (answer)is continuously resurfaced by volcanic activity.
While observing the Sun, you note a large number of sunspots. What can you conclude? - (answer)There
are likely to be an above average number of flares and prominences.
If two different stars were to form at the same time, with one three times as massive as the other, how
would the lifetime of the heavier star compare to that of the less massive one? - (answer)The less
massive star would last fifteen times as long as the more massive one
What interesting feature does Saturn's satellite Titan has on its surface? - (answer)Lakes of liquid
methane
Two stars have the same temperature with one having twice the radius of the other. How do their
luminosities differ? - (answer)The larger star is four times brighter.
Order the following objects in increasing radius (smallest to largest size): - (answer)neutron star, white
dwarf, Jupiter, Sun
Nuclear fusion, the process by which the Sun shines, fuses four ___________ atoms to produce one
__________ atom + energy and some neutrinos. - (answer)hydrogen, helium
Since dust scatters blue light more than red light, it is best to observe in the_________ wavelength to
avoid this obscuration. - (answer)infrared
What would happen to the planets orbits if the Sun will collapse into a black hole? - (answer)There will
be no change in the orbits of the planets
The solar spectrum is a good example of what kind of spectrum? - (answer)absorption line spectrum
, AST1002 EXAM 2 UF - 129 QUESTIONS WITH COMPLETE SOLUTION.
The tail of a comet consist of - (answer)dust and gas
Suppose the temperature of the surface of a star were to rise. How would this affect the star's color and
the wavelength of the lines seen in the spectrum? - (answer)The color will shift to shorter wavelength,
but the lines that are seen will not show any shift
If professor Sarajedini were to hover near a black hole while carrying a standard flashlight, how would
her light appear different from your standard flashlight as you observe her from a safe distance? -
(answer)Her light would appear redder.
A star has a parallax of 0.1 arcsec. What is its distance? - (answer)10 parsecs
A stellar remnant that is greater than 3 times the mass of the Sun will become a - (answer)black hole
What marks the transition from protostar to star - (answer)hydrogen fusion begins
Why do star clusters provide excellent tests for theories of stellar evolution? - (answer)The stars in any
particular cluster formed roughly at the same time from the same primary material and hence are
approximately the same ages as each other.
Which main sequence star will have the shortest lifetime? - (answer)O because they are the hottest
If two stars were to form at the same time in different locations, with one star twice as massive as the
other, how would their lifetimes compare? - (answer)The less massive star would live four times as long
as
the more massive one.
Proxima Centauri has the largest parallax of any known star, about three quarters of an arcsecond. This
corresponds to a distance of about - (answer)1.3 pc.
The Sun's surface, as we see it with our eyes, is called the ________________. - (answer)photosphere
Io's surface appears very smooth because it - (answer)is continuously resurfaced by volcanic activity.
While observing the Sun, you note a large number of sunspots. What can you conclude? - (answer)There
are likely to be an above average number of flares and prominences.
If two different stars were to form at the same time, with one three times as massive as the other, how
would the lifetime of the heavier star compare to that of the less massive one? - (answer)The less
massive star would last fifteen times as long as the more massive one
What interesting feature does Saturn's satellite Titan has on its surface? - (answer)Lakes of liquid
methane
Two stars have the same temperature with one having twice the radius of the other. How do their
luminosities differ? - (answer)The larger star is four times brighter.
Order the following objects in increasing radius (smallest to largest size): - (answer)neutron star, white
dwarf, Jupiter, Sun
Nuclear fusion, the process by which the Sun shines, fuses four ___________ atoms to produce one
__________ atom + energy and some neutrinos. - (answer)hydrogen, helium
Since dust scatters blue light more than red light, it is best to observe in the_________ wavelength to
avoid this obscuration. - (answer)infrared
What would happen to the planets orbits if the Sun will collapse into a black hole? - (answer)There will
be no change in the orbits of the planets
The solar spectrum is a good example of what kind of spectrum? - (answer)absorption line spectrum
, AST1002 EXAM 2 UF - 129 QUESTIONS WITH COMPLETE SOLUTION.
The tail of a comet consist of - (answer)dust and gas
Suppose the temperature of the surface of a star were to rise. How would this affect the star's color and
the wavelength of the lines seen in the spectrum? - (answer)The color will shift to shorter wavelength,
but the lines that are seen will not show any shift
If professor Sarajedini were to hover near a black hole while carrying a standard flashlight, how would
her light appear different from your standard flashlight as you observe her from a safe distance? -
(answer)Her light would appear redder.
A star has a parallax of 0.1 arcsec. What is its distance? - (answer)10 parsecs
A stellar remnant that is greater than 3 times the mass of the Sun will become a - (answer)black hole
What marks the transition from protostar to star - (answer)hydrogen fusion begins
Why do star clusters provide excellent tests for theories of stellar evolution? - (answer)The stars in any
particular cluster formed roughly at the same time from the same primary material and hence are
approximately the same ages as each other.
Which main sequence star will have the shortest lifetime? - (answer)O because they are the hottest
If two stars were to form at the same time in different locations, with one star twice as massive as the
other, how would their lifetimes compare? - (answer)The less massive star would live four times as long
as
the more massive one.
Proxima Centauri has the largest parallax of any known star, about three quarters of an arcsecond. This
corresponds to a distance of about - (answer)1.3 pc.
