by Ciro Santilli (@cirosantilli, 25)
21 cm is very long and very low energy, because he energy split is very small!
Compare it e.g. with the hydrogen 1-2 spectral line which is 121.6 nm!

Ancestors

  1. Hyperfine structure
  2. Fine structure
  3. Spectral line
  4. Emission spectrum
  5. Quantum mechanics experiment
  6. Quantum mechanics
  7. Particle physics
  8. Physics
  9. Natural science
  10. Science
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