The 21-cm line observed by radio astronomers comes from ____. the strongest radi
ID: 1793825 • Letter: T
Question
The 21-cm line observed by radio astronomers comes from ____.
the strongest radio transition in CO molecules.
energy transitions from the third to the second levels in the Bohr model for atomic hydrogen.
spin-flip transitions between the hyperfine levels of the ground state of atomic hydrogen.
transitions between rotational-vibrational levels in hydrogen molecules.
scattered radiation from dust grains in molecular clouds.
a.the strongest radio transition in CO molecules.
b.energy transitions from the third to the second levels in the Bohr model for atomic hydrogen.
c.spin-flip transitions between the hyperfine levels of the ground state of atomic hydrogen.
d.transitions between rotational-vibrational levels in hydrogen molecules.
e.scattered radiation from dust grains in molecular clouds.
Explanation / Answer
The electron spinning anti-parallel changes to a parallel-spinning, which transmits the energy with a wavelength of 21-cm.
So Answer: C
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