The Hertzsprung-Russell (HR) Diagram (AQA A-Level Physics): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What does the HR diagram plot on its axes?
What does the HR diagram plot on its axes?
Absolute magnitude vs spectral class
Approximately what percentage of observable stars are found on the main sequence?
Approximately what percentage of observable stars are found on the main sequence?
90%
Where on the HR diagram are white dwarfs located?
Where on the HR diagram are white dwarfs located?
Bottom left corner
What is the typical density range of a white dwarf in kgm?
What is the typical density range of a white dwarf in kgm?
to
Which region of the HR diagram do red giants occupy?
Which region of the HR diagram do red giants occupy?
Upper right portion
How does a star's mass relate to its main sequence lifetime?
How does a star's mass relate to its main sequence lifetime?
Inverse - more mass means shorter life
What is the main sequence lifetime of the Sun (1 solar mass, spectral class G)?
What is the main sequence lifetime of the Sun (1 solar mass, spectral class G)?
10,000 million years
What prevents a white dwarf from collapsing further under gravity?
What prevents a white dwarf from collapsing further under gravity?
Degeneracy pressure
What is the order of spectral classes from hottest to coolest?
What is the order of spectral classes from hottest to coolest?
O to M
Do stars move along the main sequence during their main sequence phase?
Do stars move along the main sequence during their main sequence phase?
No, they stay at one fixed position