Question


Star Types Quick Check
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Question
Use the diagram to answer the question.

The Hertzsprung-Russell Diagram is shown. The left y-axis is labeled luminosity and the right y-axis is labeled absolute magnitude. The bottom x-axis is labeled with temperature left parenthesis Kelvin right parenthesis. The temperatures along the bottom are 40,000, 20,000, 10,000, 7,500, 5,500, 4,500, and 3,000. The top x-axis is labeled spectral class. The spectral classes labeled along the top from left to right are O, B, A, F, G, K, and M. Spectral class O lines up with a temperature of 40,000 K. Spectral class B lines up with a temperature of 20,000 K. Spectral class A lines up with a temperature of 10,000 K. Spectral class F lines up with a temperature of 7,500 K. Spectral class G lines up with a temperature of 5,500 K. Spectral class K lines up with a temperature of 4,500 K. Spectral class M lines up with a temperature of 3,000 K. Stars of different luminosity, absolute magnitude, spectral classes, and temperatures are plotted on the graph. Red giants and supergiants are shown in the upper right quadrant, indicating lower temperatures. White dwarfs are shown in the lower left quadrant, indicating higher temperatures and lower luminosity. Different main sequence stars are shown, ranging from hot and bright in the upper left quadrant to cooler and dimmer in lower right quadrant.

Which spectral class does a star fit into if it has a surface temperature of 20,000 K?

(1 point)
Responses

A
A

M
M

B
B

G
G
Answer
Which spectral class does a star fit into if it has a surface temperature of 20,000 K?

(1 point)
Responses

A
A

M
M

B
B

G
Answer
Which piece of spectral data is necessary to determine the spectral class of a star?

(1 point)
Responses

absolute magnitude
absolute magnitude

apparent magnitude
apparent magnitude

luminosity
luminosity

temperature
Answer
Which type of star is in spectral class K and has a luminosity of 106?

(1 point)
Responses

blue giant
blue giant

white dwarf
white dwarf

red supergiant
red supergiant

red giant
Answer
Which of these properties is the best measure of a star's brightness?(1 point)
Responses

age
age

apparent magnitude
apparent magnitude

absolute magnitude
absolute magnitude

size
Answer
Which of these phrases describes the sun?(1 point)
Responses

Class G yellow star
Class G yellow star

Class A white star
Class A white star

Class M red star
Class M red star

Class O blue star
Answer
How is the sun classified on an Hertzsprung-Russell Diagram?(1 point)
Responses

as a white dwarf star
as a white dwarf star

as a supergiant star
as a supergiant star

as a giant star
as a giant star

as a main sequence star
Answered by GPT 3.5
The spectral class that a star fits into if it has a surface temperature of 20,000 K is B.
Answered by GPT 3.5
The spectral class that a star fits into if it has a surface temperature of 20,000 K is B.
Answered by GPT 3.5
The piece of spectral data that is necessary to determine the spectral class of a star is temperature.
Answered by GPT 3.5
The type of star in spectral class K and has a luminosity of 106 is a red giant.
Answered by GPT 3.5
The best measure of a star's brightness is its apparent magnitude.
Answered by GPT 3.5
The phrase that describes the sun is "Class G yellow star".
Answered by GPT 3.5
The sun is classified as a main sequence star on an Hertzsprung-Russell Diagram.