Astronomy - Ch. 28: The Milky Way (3 of 27) The 21cm Spin Flip Radiation 

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We will learn about the 21cm spin flip radiation. The Pauli Exclusion Principle states no 2 electron can exist in the same orbital having the same quantum state (quantum numbers). The fourth quantum number is the spin quantum number +1/2 or -1/2.
Next video in this series can be seen at:
• Astronomy - Ch. 28: Th...