Features of Stellar Spectra – Classifying Stars (HSC SSCE Physics): Quizzes
📚Quizzes
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Practise the questions
10 questions from this quiz
In which year did Joseph Fraunhofer observe absorption lines in the Sun's spectrum?
In which year did Joseph Fraunhofer observe absorption lines in the Sun's spectrum?
1814
What colour do the hottest stars appear?
What colour do the hottest stars appear?
Blue or white
At approximately what temperature are Balmer series absorption lines strongest?
At approximately what temperature are Balmer series absorption lines strongest?
10,000 K
Why do very hot stars (above 20,000 K) lack hydrogen absorption lines?
Why do very hot stars (above 20,000 K) lack hydrogen absorption lines?
Hydrogen becomes completely ionized
How many stars did Annie Jump Cannon classify during her career?
How many stars did Annie Jump Cannon classify during her career?
Over 225,000
What is the correct spectral sequence from hottest to coolest?
What is the correct spectral sequence from hottest to coolest?
O, B, A, F, G, K, M
What is the surface temperature range for spectral type A stars?
What is the surface temperature range for spectral type A stars?
7,500-11,000 K
What spectral type is our Sun classified as?
What spectral type is our Sun classified as?
G-type
What does the width of absorption lines in a star's spectrum indicate?
What does the width of absorption lines in a star's spectrum indicate?
Atmospheric pressure
What is a white dwarf?
What is a white dwarf?
Remnant of a star in final cooling