8th Grade 3rd 9 Weeks Test Review

According to the diagram, which of these types of stars has the greatest luminosity?

• Hot white dwarf

• Hot main sequence star

• Cool super giant

• Cool giant

Based on the above diagram, which type of stars belong to spectral class K and have the lowest luminosity?

• Giants

• White dwarfs

• Supergiants

• Main-sequence stars

Which of these can be classified as cool and bright

• A

• B

• C

• D

Which of these would be classified as cool and dim

• A

• B

• C

• D

Which of these is classified as hot and dim

• A

• B

• C

• D

Which of these is classified as hot and bright

• A

• B

• C

• D

An astronomer discovers a star that has a temperature of 3,750 K and a luminosity of 10³ L_sun. According to the diagram, which type of star did the astronomer discover?

• White dwarf

• Giant

• Main sequence

• Supergiant

A star that has a luminosity of 10^-2 and a temperature of 20,000 K is most likely a —

• Main sequence

• White dwarf

• Blue giant

• Red giant

Which section of the diagram includes the coolest, brightest stars?

• Section 1

• Section 2

• Section 3

• Section 4

How does the brightness of white dwarfs compare to the brightness of the Sun?

• The Sun is less bright than white dwarfs.

• White dwarfs are less bright than the Sun.

• White dwarfs and the Sun have the same brightness.

• White dwarfs are not seen from Earth, therefore you can not compare the brightness.