ASTRO 7N EXAM 2 2024 WITH 100

ASTRO 7N EXAM 2 2024 WITH 100%

CORRECT ANSWERS

A high-luminosity star...

• is always at a larger distance than a low-luminosity star
• emits more light than a low-luminosity star
• is always redder than a star with a lower luminosity
• is at a lower temperature than a low-luminosity star
• is always at a smaller distance than a low-luminosity star Answer✔✔ - B

If a red giant appears the same brightness as a red main sequence star, which one is further away?

• the red giant
• we cannot tell
• it depends on the phase of the moon
• the main sequence star
• they are at the same distance Answer✔✔ - A

The heaviest nuclei of all are formed...

• during helium burning
• as part of the p-p chain
• during the carbon burning
• during supernova explosion
• during all stages of stellar evolution of massive stars Answer✔✔ - D 1 / 2

Fill in the blank in the following chemical reaction that occurs in the Sun: Hydrogen-2 + proton = +

energy:

• hydrogen-2
• Hydrogen-1
• Helium-3
• Carbon-12
• Helium - 4 Answer✔✔ - C

Which of the following has the smallest radius?

• type A main sequence star
• main sequence star with surface temperature 8000K
• type K main sequence star
• white dwarf
• neutron star Answer✔✔ - E

Why does the main sequence part of a star's life end?

• the helium in the core is exhausted
• the gravitational force is no longer large enough to balance the pressure
• The hydrogen in the core is exhausted
• the temperature drops so that nuclear reactions are no longer possible
• much of the mass of the star has evaporated Answer✔✔ - C

Which of the following will have the shortest lifetime on the main sequence?

• main sequence star with surface temperature 20000K
• main sequence star with surface temperature 3000K
• main sequence star with luminosity one tenth that of the sun
• the sun
• main sequence star with mass 2 times the sun's Answer✔✔ - A
• / 2