Star Types Quick Check

Question

1 of 61 of 6 Items
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 1

The spectral class that a star fits into if it has a surface temperature of 20,000 K is B.

Answer 2

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 3

The spectral class that a star fits into if it has a surface temperature of 20,000 K is B.

Answer 4

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 5

The piece of spectral data that is necessary to determine the spectral class of a star is temperature.

Answer 6

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 7

The type of star in spectral class K and has a luminosity of 106 is a red giant.

Answer 8

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 9

The best measure of a star's brightness is its apparent magnitude.

Answer 10

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 11

The phrase that describes the sun is "Class G yellow star".

Answer 12

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

Answer 13

The sun is classified as a main sequence star on an Hertzsprung-Russell Diagram.