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Home Q & A Board Science-Related Homework Help Physics
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Tsync Tsync
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8 years ago
Ionization of hydrogen in H II regions is most visible at:
A) 12,367 nm, the Paschen alpha line.
B) 121.3 nm, the Lyman alpha ultraviolet line for 2-1 electron transition.
C) 21 cm in the radio region for the spin-flip of its electron.
D) 473.2 nm, the blue-green emission line for 4-2 electron transition.
E) 656.3 nm, Balmer alpha line for 3-2 electron transition.
Textbook 
Astronomy Today

Astronomy Today


Edition: 8th
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Minoring in physics
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RatatouilleRatatouille
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Tsync Author
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#2
8 years ago
Exactly what I needed Smiling Face with Open Mouth
Minoring in physics
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#3
8 years ago
Happy to help Slight Smile
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