Stars Classification in Hertzsprung-Russell diagram

Define nuclear fusion. (S.C. 1)

• Nuclear fusion – combining lighter atoms to make heavier ones – is what makes it possible.

• Nuclear fusion – splitting lighter atoms to make heavier ones – is what makes it possible.

• Nuclear fusion – combining heavier atoms to make lighter ones – is what makes it possible.

• Nuclear fusion – splitting heavier atoms to make lighter ones – is what makes it possible.

In nuclear fusion, smaller atoms are forced together to create larger atoms. Does this process release, absorb or maintain energy? (S.C. 1)

• Absorb energy
• Maintain energy
• Release energy

Nuclear fusion is the reaction that generates energy in stars. (S.C. 1)

• True

• False

What are the four types of stars that can be found on the HR Diagram? (S.C. 2)

• main sequence, giant, supergiant, white dwarf

• main sequence, giant, supernova, white dwarf

• main sequence, nebula, supergiant, black hole

• main sequence, giant, neutron star, black dwarf

White dwarfs are ____________ than giants. (S.C. 2)

• cooler and dimmer

• cooler and brighter

• warmer and dimmer

• warmer and brighter

In the diagram given, what happens as we move to the left? (S.C. 2)

• Stars Get Larger
• Stars get Colder
• Stars get hotter

On the H-R diagram, the Sun is a _____. (S.C. 3)

• Main Sequence star
• Red Giant
• White Dwarf
• Blue Giant

Which star has the lowest temperature? (S.C. 3)

• A
• B
• C
• D

Use the Hertzsprung-Russell Diagram to answer the following question.  Betelgeuse is a _____

(S.C. 3)

• Hot and Bright Star
• Cool and Bright Star
• Hot and Dim Star
• Cool and Dim Star

Which of these observations of Proxima Centuri's Star is most likely accurate? (S.C. 3)

• Proxima Centuri's Star is less bright than the sun and has a surface temperature below 3,400 K
• Proxima Centuri's Star is less bright than the sun and has a surface temperature above 3,400 K
• Proxima Centuri's Star is brighter than the sun and has a surface temperature below 4,000 K
• Proxima Centuri's Star is brighter than the sun and has a surface temperature above 4,000 K