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AQA A-level Physics (7408) - Stellar Spectral Classes-Qs & As
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AQA A-level Physics (7408) - Stellar Spectral Classes-Qs & As
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AQA A-level Physics (7408) - Stellar Spectral Classes-Qs& As
What is the mnemonic for the spectral classes? Correct Ans-Only Bad Astronomers Forget
Generally Known Mnemonics.
Colour of O class stars. Correct Ans-Blue.
Temperature of O class stars. Correct Ans-25 000 - 50 000
Absorption lines of O class stars. Correct Ans-The strongest spectral lines are helium-plus
(He+) and helium atom (He) absorptions, since these need a really high temperature. They
have weak hydrogen (H) Balmer lines too.
Colour of B class stars. Correct Ans-Blue.
Temperature of B class stars. Correct Ans-11 000 - 25 000
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