What Atomic Transition Occurs in Atoms of Hydrogen Gas in the Galactic

question 4

Multiple Choice

What atomic transition occurs in atoms of hydrogen gas in the galactic spiral arms to produce 21-cm radio emission?

• A) The change in the vibrational state of the H atoms in the H₂ molecule
• B) The transition from the n = 2 to n = 1 level in atomic hydrogen
• C) The inversion of the electron spin relative to the proton spin,from parallel to anti-parallel
• D) The change in rotation about an axis perpendicular to the molecular axis in the molecule H₂

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