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Calculate the energy difference between the m_s = 1/ 2 (“spin up”) and m_s = - 1 /2 (“spin down”) levels of a hydrogen atom in the 1s state when it is placed in a 1.45 T magnetic field in the negative z@direction. Which level, m_s = 1 /2 or ms = - 1/ 2 , has the lower energy?

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