p41_019 - 19. The energy of a magnetic dipole in an...

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Unformatted text preview: 19. The energy of a magnetic dipole in an external magnetic field B is U = −µ · B = −µz B , where µ is the magnetic dipole moment and µz is its component along the field. The energy required to change the moment direction from parallel to antiparallel is ∆E = ∆U = 2µz B . Since the z component of the spin magnetic moment of an electron is the Bohr magneton µB , ∆E = 2µB B = 2(9.274 × 10−24 J/T)(0.200 T) = 3.71 × 10−24 J. The photon wavelength is λ= c hc (6.63 × 10−34 J · s)(3.00 × 108 m/s) = = = 5.36 × 10−2 m . f ∆E 3.71 × 10−24 J ...
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

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