E.5 Quiz 2

What does the HR diagram plot stars based on?

• Size and age

• Color and distance

• Temperature and luminosity

• Mass and brightness

Which property is NOT commonly used to measure stars?

• Color

• Radius

• Mass

• Luminosity

What is the approximate percentage of stars that are white dwarfs?

• 90%

• 0%

• 5%

• 1%

What phase does the Sun enter after most hydrogen has finished fusing?

• Main sequence

• Red giant

• White dwarf

• Supernova

What is the main sequence star primarily fusing?

• Helium

• Carbon

• Hydrogen

• Iron

What happens to a star when its hydrogen supply becomes too low?

• It starts fusing iron

• It expands and cools

• It becomes a black hole

• It collapses under gravity

What is the fate of the most massive stars after the red supergiant phase?

• They become white dwarfs

• They remain as red giants

• They become neutron stars

• They explode as supernovae

What is the primary characteristic of a neutron star?

• It is extremely dense

• It emits a lot of light

• It is very large

• It has a strong magnetic field

Which law relates the temperature of a black body radiator to the peak wavelength of light emitted?

• Planck's law

• Newton's law

• Wien’s displacement law

• Stefan-Boltzmann law

What is the approximate age range of stars in the main sequence?

• Young to billions of years old

• A few million years

• Trillions of years

• Only a few thousand years