4) Atomic hydrogen can produce a sharp spectral line called the 21-cm radiation which is not generated by an electron transition between energy states of different n values. Instead, in the ground state (n=1), the electron and proton spins may be parallel or anti-parallel, with a resultant slight difference in these energy states.

More precisely, the line has wavelength 21.11 cm. What is the energy difference between the states?

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The hydrogen atom composed of a positively charged particle proton and a nega... View the full answer