Which is the first stage in the life cycle of a massive star?
nebula
nebula
red giant
red giant
white drawf
white drawf
black hole
nebula
Select the correct answer from the list.(1 point)
As a star's size increases, its luminosity
. As a star's temperature
, its luminosity increases.
As a star's size increases, its luminosity increases.
As a star's temperature , its luminosity increases.
does it decrease or increase?
As a star's temperature increases, its luminosity increases.
Which statement correctly explains how the Hertzsprung-Russell diagram helps to compare stars?(1 point)
Responses
The Hertzsprung-Russell diagram plots stars according to their size and shape.
The Hertzsprung-Russell diagram plots stars according to their size and shape.
The Sun's high temperature places it to the far left of the Hertzsprung-Russell diagram.
The Sun's high temperature places it to the far left of the Hertzsprung-Russell diagram.
Stars with the highest temperatures appear towards the right side of the Hertzsprung-Russell diagram.
Stars with the highest temperatures appear towards the right side of the Hertzsprung-Russell diagram.
The Hertzsprung-Russell diagram plots stars according to their luminosity and temperature, which is also associated with spectral class.
The Hertzsprung-Russell diagram plots stars according to their luminosity and temperature, which is also associated with spectral class.
The Hertzsprung-Russell diagram plots stars according to their luminosity and temperature, which is also associated with spectral class.
Which state of matter best describes the elements inside stars?(1 point)
Responses
solid
solid
gas
gas
plasma
plasma
liquid
plasma
Which describe the study of spectroscopy? Select the two correct answers.(1 point)
Responses
the number of galaxies
the number of galaxies
interaction of light and atoms
interaction of light and atoms
emission and absorption of light
emission and absorption of light
reflection of light by Earth
The correct answers are:
- Interaction of light and atoms
- Emission and absorption of light
According to the diagram, where do all stars begin their evolution?
(1 point)
Responses
stellar nebula
stellar nebula
white dwarf
white dwarf
supernova
supernova
red giant
According to the diagram, all stars begin their evolution at the stellar nebula stage.
In which spectral class does a white dwarf with a temperature of 10,000 K belong?
(1 point)
Responses
A
A
B
B
F
F
O
O
A white dwarf with a temperature of 10,000 K belongs to the A spectral class.
Why are spectral lines useful in classifying stars?(1 point)
Responses
They show a star's location.
They show a star's location.
They show the composition of a star.
They show the composition of a star.
They show the layers that make up a star.
They show the layers that make up a star.
They indicate a star's age.
They indicate a star's age.
Spectral lines are useful in classifying stars because they show the composition of a star.
The Sun, like 80 to 90 percent of stars, is in which stage of life?(1 point)
Responses
red giant
red giant
stellar formation
stellar formation
main sequence
main sequence
dying star
The Sun, like 80 to 90 percent of stars, is in the main sequence stage of its life.
Which of these is a heavy element in a star?(1 point)
Responses
helium
helium
carbon
carbon
lithium
lithium
hydrogen
Carbon is a heavy element in a star.
Which are examples of non-visible light?(1 point)
Responses
rainbows and X-rays
rainbows and X-rays
white light from the sun and microwaves
white light from the sun and microwaves
radio waves and ultraviolet light
radio waves and ultraviolet light
white light from a lightbulb and rainbows
white light from a lightbulb and rainbows