A Level Physics - Spectral Classes

Name the spectral classes' respective colour, temperature range and details about their absorption lines.

Temperature units are Kelvin

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Last updated: January 8, 2019

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First submitted	January 8, 2019
Times taken	16
Average score	30.0%
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Question	Answer
What is the colour of stars in the O spectral class?	Blue
What is the colour of stars in the B spectral class?	Blue
What is the colour of stars in the A spectral class?	Blue-white
What is the colour of stars in the F spectral class?	White
What is the colour of stars in the G spectral class?	Yellow-white
What is the colour of stars in the K spectral class?	Orange
What is the colour of stars in the M spectral class?	Red
What is the maximum temperature of the O spectral class?	50,000
What is the minimum temperature of the O spectral class?	25,000
What is the maximum temperature of the B spectral class?	25,000
What is the minimum temperature of the B spectral class?	11,000
What is the maximum temperature of the A spectral class?	11,000
What is the minimum temperature of the A spectral class?	7,500
What is the maximum temperature of the F spectral class?	7,500
What is the minimum temperature of the F spectral class?	6,000

Question	Answer
What is the maximum temperature of the G spectral class?	6,000
What is the minimum temperature of the G spectral class?	5,000
What is the maximum temperature of the K spectral class?	5,000
What is the minimum temperature of the K spectral class?	3,500
What is the maximum temperature of the M spectral class?	3,500
What is the minimum temperature of the M spectral class?	0
What are the strongest spectral lines in the O class?	Helium+ ion and helium
What other lines are present in the O class?	Hydrogen
What are the strongest spectral lines in the B class?	Helium and hydrogen
What is the most prevalent absorption in the A class?	Hydrogen
What other lines are present in the A class?	Metal ion
What are the strongest spectral lines in the F class?	Metal ion
What spectral lines are present in the G class?	Metal ion/atom
What are the most prevalent absorptions in the K class?	Metal atom
What spectral lines are present in the M class?	Atom and molecule

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