Which describe the study of spectroscopy? Select the two correct answers.(1 point)
interaction of light and atoms
reflection of light by Earth
emission and absorption of light
the number of galaxies
The two correct answers are:
1. Interaction of light and atoms.
2. Emission and absorption of light.
Which is the first stage in the life cycle of a massive star?(1 point)
nebula
black hole
white drawf
red giant
The correct answer is nebula.
According to the diagram, where do all stars begin their evolution?
(1 point)
white dwarf
supernova
red giant
stellar nebula
According to the diagram, all stars begin their evolution in a stellar nebula.
The Sun, like 80 to 90 percent of stars, is in which stage of life?(1 point)
dying star
stellar formation
red giant
main sequence
The Sun is currently in the main sequence stage of its life cycle.
Use the diagram to answer the question.
A graph illustrates the relationship between the luminosity (Sun = 1), ranging from 0.0001 to 10000, and temperature in Kelvin, ranging from 30000 to 3000, for various stars classifications. Main sequence stars extend diagonally from the top left to the bottom right corner of the graph. The White Dwarfs, Giants, and Super Giants are placed on the graph according to their luminosity and temperature.
Which spectral class would a star fit into if it had a surface temperature of 20,000 K?
(1 point)
Responses
A
O
B
F
Based on the given information, a star with a surface temperature of 20,000 K would fit into the spectral class B.
Which state of matter best describes the elements inside stars?(1 point)
gas
solid
liquid
plasma
The state of matter that best describes the elements inside stars is plasma.
Which statement correctly explains how the Hertzsprung-Russell diagram helps to compare stars?(1 point)
Stars with the highest temperatures appear towards the right side of the Hertzsprung-Russell diagram.
The Hertzsprung-Russell diagram plots stars according to their size and shape.
The Hertzsprung-Russell diagram plots stars according to their luminosity and temperature, which is also associated with spectral class.
The Sun's high temperature places it to the far left of the Hertzsprung-Russell diagram.
The statement that correctly explains how the Hertzsprung-Russell diagram helps to compare stars is: "The Hertzsprung-Russell diagram plots stars according to their luminosity and temperature, which is also associated with spectral class."
Which are examples of non-visible light?(1 point)
white light from the sun and microwaves
white light from a lightbulb and rainbows
radio waves and ultraviolet light
rainbows and X-rays
Examples of non-visible light include radio waves and ultraviolet light.
Why are spectral lines useful in classifying stars?(1 point
They indicate a star's age.
They show the layers that make up a star.
They show the composition of a star.
They show a star's location.
Spectral lines are useful in classifying stars because they show the composition of a star.
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.
The correct answer is:
- As a star's size increases, its luminosity increases.
- As a star's temperature increases, its luminosity increases.
Which of these is a heavy element in a star?(1 point)
helium
carbon
hydrogen
lithium