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I need help for this questions. Please, help to me. 1- Telescopes either apply the principles of ?(via a lens) or ?
I need help for this questions. Please, help to me.
1- Telescopes either apply the principles of ?(via a lens) or ?(via a concave mirror) to form magnified images of astronomical objects.
Question 2
What are two reasons for why most modern astronomical telescopes make use of mirrors rather than lense
Question 3
An advantage of larger mirrors and lenses is that they have greater -gathering power and a superior ability to small details.
Question 4
Analyzing the spectrum of a star can reveal what about the star? Select all that apply!
The composition of the star.
The motion of the star.
The surface temperature of the star.
The magnetic field of the star.
The mass of the star.
The radius of the star.
Question 5
The "surface" of the Sun is called the , and it has a temperature of K.
Question 6
5 pts
The most abundant element in the Sun is , while the second most abundant is .
Question 7
The of the Sun consists of ionized atoms and electrons at temperatures up to 2 million Kelvin; however, the light it produces is so faint that it is only easily seen during a total eclipse.
Question 8
The aurora in the northern hemisphere and the aurora in the southern hemisphere are caused by the stream of protons, electrons, and other ions from the Sun known as the . These charged particles excite molecules in the air, which then radiate in different wavelengths of light (for example, gives off green wavelengths and gives off blue wavelengths).
Question 9
5 pts
are patches on the Sun's surface that appear dark due to being than the rest of the Sun's surface. Their number rise and fall in a regular cycle that lasts an average of years.
Question 10
On Earth, some 150 million kilometers from the Sun, sunlight can deliver energy at a rate of kW over an area of a square meter. This implies that the Sun's total energy output occurs at a rate of x 10 W.
Question 11
Inside the core of the Sun, temperatures are thought to reach
[ Select ]
["
35
", "
15
", "
25
", "
5
"]
[ Select ]
["
billion
", "
trillion
", "
million
"] K, while pressures are on the order of a
[ Select ]
["
trillion
", "
million
", "
billion
"] atm.
Question 12
5 pts
By what process is energy produced in the core of the Sun (and other stars as well)? Be as specific as possible.
Question 13
The ________________ of a star (determined after observing the star 6 months apart) can be used to determine the distance to a star, but it is only effective for the closest stars to us.
Question 14
A star's
[ Select ]
["
brightness
", "
luminosity
"] is how much light in total it emits into space. Its
[ Select ]
["
brightness
", "
luminosity
"] depends upon how much of that light reaches an observer on Earth.
Question 15
The longer the period of a Cepheid variable, the greater its
[ Select ]
["
mass
", "
size
", "
luminosity
", "
temperature
"] . Comparing this to its brightness allows astronomers to determine
[ Select ]
["
the distance to the Cepheid.
", "
the composition of the Cepheid.
", "
the density of the Cepheid.
", "
the speed of the Cepheid.
"] .
Question 16
Correctly label the various regions of this H-R diagram.
A
[ Select ]
["
white dwarfs
", "
red dwarfs
", "
main sequence
", "
supergiants
", "
giants
"] B
[ Select ]
["
giants
", "
main sequence
", "
red dwarfs
", "
supergiants
", "
white dwarfs
"] C
[ Select ]
["
supergiants
", "
main sequence
", "
red dwarfs
", "
white dwarfs
", "
giants
"] D
[ Select ]
["
red dwarfs
", "
white dwarfs
", "
main sequence
", "
supergiants
", "
giants
"] E
[ Select ]
["
red dwarfs
", "
giants
", "
white dwarfs
", "
supergiants
", "
main sequence
"]
Question 17
Stars at the upper end of the main sequence are
[ Select ]
["
hotter
", "
cooler
"] ,
[ Select ]
["
smaller
", "
larger
"] , and
[ Select ]
["
more massive
", "
less massive
"] than stars at the lower end.
Question 18
Describe the early history of the Sun. What did it start as? What lead to it becoming a smallish main sequence star?
Question 19
Describe the future of the Sun. Roughly how long will it take for the Sun to leave the main sequence? What will happen when it leaves the main sequence? Will the Sun go supernova?
Question 2
The remnants of stars 25 to 40 times more massive than the Sun may have such a strong ? pull that their escape speeds exceed the speed of ?, resulting in a ? .
