Question

4 multiple choice 2 points
compared to the luminosity and surface temperature of red main sequence stars, blue supergiants are
less luminous and have a lower surface temperature
less luminous and have a higher surface temperature
more luminous and have a lower surface temperature
more luminous and have a higher surface temperature
5 multiple choice 2 points
energy is produced within a stars core by the process of
insolation
conduction
nuclear fusion
radioactive decay
6 multiple choice 2 points
which of the following are not labels for the axes of the hr diagram?
luminosity
temperature
absolute magnitude
mass

Explanation:

• Question 4: Blue supergiants are more luminous and hotter (higher surface temperature) than red main - sequence stars. This is based on the properties of stars in different evolutionary stages and their positions on the Hertzsprung - Russell (HR) diagram.
• Question 5: Nuclear fusion is the process that occurs in a star's core to produce energy. Insolation is the incoming solar radiation on Earth, conduction is a heat transfer mechanism (not the energy - production process in stars), and radioactive decay is not the main energy - production process in stars.
• Question 6: The axes of the HR diagram are typically luminosity (or absolute magnitude) and temperature. Mass is not a standard label for the axes of the HR diagram.

Answer:

1. more luminous and have a higher surface temperature
2. nuclear fusion
3. Mass