Visual Wavelength Absorption Lines of Hydrogen Are Very Weak in Cool

question 41

Multiple Choice

Visual wavelength absorption lines of hydrogen are very weak in cool stars like red dwarfs.The Lyman lines of hydrogen involve transitions from the ground state to the first excited state.What would you say about the strength of the Lyman lines in red dwarfs?

• A)They should be quite strong
• B)They should be no stronger than the visual wavelength lines
• C)There will be no such transitions in this type of star
• D)Lines will be weak;these stars have little hydrogen

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