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the magnet used in a stern gerlach experiment is .15 m long and has a field...

the magnet used in a stern gerlach experiment is .15 m long and has a field gradient of dB/dz = 9T/m over its full length. If a beam of sodium atoms of speed 600 m/s passes through this magnet and then strikes a photographic plate at a distance of .80 m beyond the magnet, what will be the separation between the two impact zones on the film? sodium has a total angular momentum quantum number J=1/2, contributed by the spin of the single electron in the 3s subshell.

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