Neutral Hydrogen Is Most Obvious in the Electromagnetic Spectrum

question 100

Multiple Choice

Neutral hydrogen is most obvious in the electromagnetic spectrum:

• A)in yellow light of the Sun's continuum.
• B)at 656.3 nm, hydrogen alpha red.
• C)at 21 cm in the radio region.
• D)at 121.3 nm, the Lyman alpha ultraviolet line.
• E)Neutral hydrogen has yet to be detected in space.

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