1190_Physics ProblemsTechnical Physics

1190_Physics ProblemsTechnical Physics - Chapter 42 *P42.39...

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Chapter 42 531 *P42.39 In the ground state of sodium, the outermost electron is in an s state. This state is spherically symmetric, so it generates no magnetic field by orbital motion, and has the same energy no matter whether the electron is spin-up or spin-down. The energies of the states 3 p A and 3 p B above 3 s are hf hc 1 = λ and hf hc 2 2 = . The energy difference is 2 11 12 µ λλ B Bh c =− F H G I K J so B hc B F H G I K J = ×⋅ × × × × F H G I K J −− 2 663 10 3 10 2 9 27 10 1 588 995 10 1 589 592 10 34 8 24 99 µλ λ . . .. Js ms JT m m ej e j B = 18 4 . T . Section 42.8 More on Atomic Spectra: Visible and X-ray P42.40 (a) nm == = 30 0 ,, A A = 31 1 0 1 , , A A For = 32 2 1 0 1 2 , , , , A A (b) ψ 300 corresponds to E ZE n 300 2 0 2 2 2 21 3 6 3 605 = − . . af eV . ψψ 31 1 310 311 , , have the same energy since n is the same. ψψψ 32 2
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